ci: update actions/checkout to latest version

This avoids part of the deprecation notes aout `Node.js 16 actions`.

It is curious why Dependabot missed `actions/checkout`... in
git-for-windows/git#4796 it was successful for
git-for-windows/git, but an equivalent is nowhere to be seen in
https://github.com/git-for-windows/git-for-windows-automation/pulls?q=is%3Apr+author%3Aapp%2Fdependabot+checkout.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

.github/actions/gitforwindows.org/action.yml

@@ -24,7 +24,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/actions/github-release/action.yml

@@ -46,7 +46,7 @@ outputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/actions/mail-announcement/action.yml

@@ -36,7 +36,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/actions/nuget-packages/action.yml

@@ -36,7 +36,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/actions/pacman-packages/action.yml

@@ -45,7 +45,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/actions/repository-updates/action.yml

@@ -33,7 +33,7 @@ inputs:
 runs:
   using: "composite"
   steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         ref: release
     - name: Mirror Check Run to ${{ inputs.owner }}/${{ inputs.repo }}

.github/workflows/build-and-deploy.yml

@@ -38,7 +38,7 @@ jobs:
   build:
     runs-on: ${{ github.event.inputs.architecture == 'aarch64' && fromJSON('["Windows", "ARM64"]') || 'windows-latest' }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
         # Since we want to operate on _another_ repository, we sadly cannot use:
         #

.github/workflows/create-azure-self-hosted-runners.yml

@@ -61,7 +61,7 @@ jobs:
         VM_NAME="actions-runner-$(date +%Y%m%d%H%M%S%N)"
         echo "Will be using $VM_NAME as the VM name"
         echo "vm_name=$VM_NAME" >> $GITHUB_OUTPUT
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Obtain installation token
       id: setup
       uses: actions/github-script@v7

.github/workflows/git-artifacts.yml

@@ -52,7 +52,7 @@ jobs:
       check-run-state: ${{steps.check-run-state.outputs.check-run-state}}
     steps:
       - name: clone git-for-windows-automation
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Construct bundle-artifacts from existing tag
         if: env.EXISTING_GIT_TAG != ''
         run: |
@@ -363,7 +363,7 @@ jobs:
     steps:
       - name: clone git-for-windows-automation
         if: needs.pkg.outputs.check-run-state != '' && always()
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Download pkg-${{env.ARCHITECTURE}}
         uses: actions/download-artifact@v4
         with:
@@ -497,7 +497,7 @@ jobs:
           path: sha256sums
       - name: clone git-for-windows-automation
         if: needs.pkg.outputs.check-run-state != '' && always()
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: restore check-run state
         if: needs.pkg.outputs.check-run-state != '' && always()
         id: check-run-state

.github/workflows/open-pr.yml

@@ -39,7 +39,7 @@ jobs:
           esac &&
           echo "REPO=$repo" >>$GITHUB_ENV &&
           echo "repo=$repo" >>$GITHUB_OUTPUT
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         # Since we want to operate on _another_ repository, we sadly cannot use:
         #
         # permissions:

.github/workflows/release-git.yml

@@ -29,7 +29,7 @@ jobs:
       announcement: ${{ steps.bundle-artifacts.outputs.announcement }}
       release-notes: ${{ steps.bundle-artifacts.outputs.release-notes }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: The `release` branch must be up to date
         uses: actions/github-script@v7
         with:

.github/workflows/tag-git.yml

@@ -35,7 +35,7 @@ jobs:
     outputs:
       tag-name: ${{ steps.generate.outputs.tag-name }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Mirror Check Run to ${{ env.OWNER }}/${{ env.REPO }}
         if: env.CREATE_CHECK_RUN != 'false'
         uses: ./.github/actions/check-run-action

.github/workflows/updpksums.yml

@@ -26,7 +26,7 @@ jobs:
   updpkgsums:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         # Since we want to operate on _another_ repository, we sadly cannot use:
         #
         # permissions: