Merge pull request #1621 from macvim-dev/dependabot/github_actions/actions/cache-5

CI: Bump actions/cache from 4 to 5

Author: ychin

.github/workflows/macvim-buildtest.yaml

@@ -125,7 +125,7 @@ jobs:
       # Note: Legacy self-hosted runner already has this installed and doesn't need this.
       - name: Cache Python 2
         if: inputs.publish && !inputs.legacy
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: python27-cache
           key: ${{ inputs.os }}-python27