chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/buildifier.yaml

@@ -12,7 +12,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.16.0
         with:
           bazelisk-cache: true

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
           - "examples/aggregate"
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: bazel-contrib/setup-bazel@0.16.0
         with:
           bazelisk-cache: true
@@ -32,7 +32,7 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: pre-commit/action@v3.0.1
 
   conclusion:

.github/workflows/tag.yaml

@@ -22,7 +22,7 @@ jobs:
       new-tag-version-type: ${{ steps.ccv.outputs.new-tag-version-type }}
       recently-tagged: ${{ steps.recent-tag.outputs.recently-tagged }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           # Need enough history to find the prior release tag
           fetch-depth: 0