Update actions/cache action to v5 (#3007)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/lint.yml

@@ -28,7 +28,7 @@ jobs:
 
       # Cache Go build cache for faster compilation during linting
       - name: Cache Go build cache
-        uses: actions/cache@v4
+        uses: actions/cache@a7833574556fa59680c1b7cb190c1735db73ebf0 # v5
         with:
           path: ~/.cache/go-build
           key: ${{ runner.os }}-go-build-lint-${{ hashFiles('**/go.sum') }}

.github/workflows/test.yml

@@ -29,7 +29,7 @@ jobs:
       # Cache Go build cache for faster compilation
       # Note: ~/go/pkg/mod is already cached by actions/setup-go with cache: true
       - name: Cache Go build cache
-        uses: actions/cache@v4
+        uses: actions/cache@a7833574556fa59680c1b7cb190c1735db73ebf0 # v5
         with:
           path: ~/.cache/go-build
           key: ${{ runner.os }}-go-build-${{ hashFiles('**/go.sum') }}
@@ -39,7 +39,7 @@ jobs:
       # Cache Go tools (gotestfmt only for tests)
       - name: Cache Go tools
         id: cache-go-tools
-        uses: actions/cache@v4
+        uses: actions/cache@a7833574556fa59680c1b7cb190c1735db73ebf0 # v5
         with:
           path: ~/go/bin
           key: ${{ runner.os }}-go-tools-${{ hashFiles('go.mod') }}-gotestfmt-v2

.github/workflows/verify-gen.yml

@@ -20,7 +20,7 @@ jobs:
       # Cache Go tools (mockgen)
       - name: Cache Go tools
         id: cache-go-tools
-        uses: actions/cache@v4
+        uses: actions/cache@a7833574556fa59680c1b7cb190c1735db73ebf0 # v5
         with:
           path: ~/go/bin
           key: ${{ runner.os }}-go-codegen-tools-${{ hashFiles('go.mod') }}-mockgen