renovate: group alpine and golang updates

Group the updates of each of these two images together so that we don't
have a PR for each version type. For example, we don't need to have a PR
for a digest change together with an update for minor, we can simply
have the minor update instead.

Signed-off-by: André Martins <andre@cilium.io>

.github/renovate.json5

@@ -217,6 +217,14 @@
         "images/operator/Dockerfile",
         "images/kvstoremesh/Dockerfile"
       ],
+      "matchUpdateTypes": [
+        "major",
+        "minor",
+        "digest",
+        "patch",
+        "pin",
+        "pinDigest"
+      ]
     },
     {
       // Images that directly use docker.io/library/alpine for building.
@@ -229,6 +237,14 @@
         "images/operator/Dockerfile",
         "images/kvstoremesh/Dockerfile"
       ],
+      "matchUpdateTypes": [
+        "major",
+        "minor",
+        "digest",
+        "patch",
+        "pin",
+        "pinDigest"
+      ],
     },
     {
       "groupName": "spire-images",