ci: speed up checkout and upgrade actions (#8064)

Signed-off-by: Dmitry Tokarev <dtokarev@nvidia.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/shared-deploy-test.yml

@@ -45,7 +45,7 @@ jobs:
     name: ${{ matrix.profile }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955  # v4.3.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       - name: Check if vCluster exists
         id: vcluster-check
         uses: ./.github/actions/check-vcluster-exists

.github/workflows/shared-test.yml

@@ -88,7 +88,7 @@ jobs:
     runs-on: ${{ matrix.platform == 'amd64' && inputs.amd_runner || 'prod-tester-arm-v1' }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955  # v4.3.0
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
       - name: Calculate target tag
         id: calculate-target-tag
         shell: bash

.github/workflows/trigger_ci.yml

@@ -34,7 +34,7 @@ jobs:
       group: gitlab_ci_runners
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
     - name: Sync Mirror Repository
       run: ./.github/workflows/mirror_repo.sh ${{ secrets.PROJECT_ACCESS_TOKEN }} ${{ secrets.MIRROR_URL }}
 
@@ -46,7 +46,7 @@ jobs:
       group: gitlab_ci_runners
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
     - name: Detect source code changes
       id: src_changes
       uses: dorny/paths-filter@v3