chore(deps): update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/k8s-diff.yaml

@@ -5,7 +5,7 @@ jobs:
     name: Base
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
         with:
           ref: ${{ github.event.pull_request.base.sha }}
       - uses: bazelbuild/setup-bazelisk@v2
@@ -31,7 +31,7 @@ jobs:
     name: Head
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Mount bazel cache
         uses: actions/cache@v3

.github/workflows/k8s.yaml

@@ -7,7 +7,7 @@ jobs:
     name: Unwind
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - uses: tailscale/github-action@v2
         with:
           oauth-client-id: ${{ secrets.TS_OAUTH_CLIENT_ID }}

.github/workflows/test.yaml

@@ -5,7 +5,7 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - uses: bazelbuild/setup-bazelisk@v2
       - name: Test
         run: |