ci: remove macos-11; add macos-13; upgrade to checkout@v4 and upload-…

…artifact@v4 (#69)

* ci: upgrade to checkout@v4 and upload-artifact@v4

* ci: remove macos-11; add macos-13

macos-11 will be removed by the end of June; replace it with macos-13.
macos-14 a.k.a. macos-latest is already covered by cmake-fat.yml.

.github/workflows/cmake-fat.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -32,7 +32,7 @@ jobs:
       run: make mpw
 
     - name: Archive
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: mpw fat
         path: ${{runner.workspace}}/build/bin/mpw

.github/workflows/cmake.yml

@@ -11,10 +11,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-12, macos-11]
+        os: [macos-12, macos-13]
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
@@ -35,8 +35,7 @@ jobs:
       run: cmake --build . --config $BUILD_TYPE
 
     - name: Archive
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: mpw ${{ matrix.os }}
         path: ${{runner.workspace}}/build/bin/mpw
-