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

Author: renovate[bot]

.github/workflows/build-gem.yml

@@ -23,7 +23,7 @@ jobs:
       FLAKY: ${{ startsWith(inputs.version, 'jruby') && 'true' || 'false' }}
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: launchdarkly/gh-actions/actions/persistent-stores@persistent-stores-v0
         with:

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: ./.github/actions/setup
         with:
@@ -42,7 +42,7 @@ jobs:
         shell: powershell
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: ./.github/actions/setup
         with:

.github/workflows/manual-publish-docs.yml

@@ -10,7 +10,7 @@ jobs:
       contents: write # Needed in this case to write github pages.
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: ./.github/actions/setup
         with:

.github/workflows/manual-publish.yml

@@ -28,7 +28,7 @@ jobs:
       attestations: write # Needed for actions/attest.
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: ./.github/actions/setup
         with:

.github/workflows/release-please.yml

@@ -45,7 +45,7 @@ jobs:
       attestations: write # Needed for actions/attest.
 
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - uses: ./.github/actions/setup
         with: