ci: upgrade GitHub Actions to Node 24 runtime (#2401)

.github/workflows/backend-tests.yml

@@ -70,7 +70,7 @@ jobs:
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
       - name: Cache Go modules
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: |
             ~/go/pkg/mod
@@ -173,7 +173,7 @@ jobs:
         run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
       - name: Cache Go modules
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: |
             ~/go/pkg/mod
@@ -237,14 +237,14 @@ jobs:
               '
 
       - name: Generate test report
-        uses: robherley/go-test-action@3856e4e57831b3b6d6d8d89f91747e5200c533f7 # v0
+        uses: robherley/go-test-action@2f859e0c8769d755d3174eecb9af8f64660827f3 # v1.1.0
         if: always()
         with:
           fromJSONFile: apps/backend/test-results-${{ matrix.shard }}.json
           omit: successful
 
       - name: Upload test artifacts
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         if: always()
         with:
           name: backend-test-results-${{ matrix.shard }}