Upgrade GitHub Actions for Node 24 compatibility

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Author: salmanmkc

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
       cancel-in-progress: true
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
 
     # Set up ccache
     - name: ccache
@@ -52,7 +52,7 @@ jobs:
       run: cmake --build ${{ github.workspace }}/build --preset ${{ matrix.preset }} --config ${{ matrix.build_type }} -j 4
 
     - name: Archive production artifacts
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: gemma-${{ matrix.os }}-${{ matrix.preset }}-${{ matrix.build_type }}
         path: |
@@ -69,11 +69,11 @@ jobs:
         with:
           egress-policy: audit  # cannot be block - runner does git checkout
 
-      - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4.0.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
 
       - uses: bazelbuild/setup-bazelisk@b39c379c82683a5f25d34f0d062761f62693e0b2 # v3.0.0
 
-      - uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4.2.2
+      - uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306  # v5.0.3
         with:
           path: ~/.cache/bazel
           key: bazel-${{ runner.os }}