CI: Pin actions/cache/restore to commit hash

The v4 tag currently points to v4.3.0 which is
0057852bfa.

https://github.com/actions/cache/releases/tag/v4.3.0

.github/workflows/build-project.yaml

@@ -103,7 +103,7 @@ jobs:
 
           print "xcodeCasPath=${xcode_cas_path}" >> $GITHUB_OUTPUT
 
-      - uses: actions/cache/restore@v4
+      - uses: actions/cache/restore@0057852bfaa89a56745cba8c7296529d2fc39830
         id: xcode-cache
         with:
           path: ${{ steps.setup.outputs.xcodeCasPath }}
@@ -191,7 +191,7 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
-      - uses: actions/cache/restore@v4
+      - uses: actions/cache/restore@0057852bfaa89a56745cba8c7296529d2fc39830
         id: ccache-cache
         with:
           path: ${{ github.workspace }}/.ccache