chore(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/evals-nightly.yml

@@ -20,7 +20,7 @@ jobs:
       matrix: '${{ steps.set-matrix.outputs.matrix }}'
     steps:
       - name: 'Checkout code'
-        uses: 'actions/checkout@v4' # ratchet:exclude
+        uses: 'actions/checkout@v6' # ratchet:exclude
       - id: 'set-matrix'
         run: |
           FILES=$(find evals -maxdepth 1 -name "*.eval.ts" | sort | jq -R -s -c 'split("\n")[:-1]')
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: 'Checkout code'
-        uses: 'actions/checkout@v4' # ratchet:exclude
+        uses: 'actions/checkout@v6' # ratchet:exclude
 
       - name: 'Set up Node.js'
         uses: 'actions/setup-node@v4' # ratchet:exclude
@@ -79,7 +79,7 @@ jobs:
     runs-on: 'ubuntu-22.04'
     steps:
       - name: 'Checkout code'
-        uses: 'actions/checkout@v4' # ratchet:exclude
+        uses: 'actions/checkout@v6' # ratchet:exclude
 
       - name: 'Set up Node.js'
         uses: 'actions/setup-node@v4' # ratchet:exclude

.github/workflows/gemini-invoke.yml

@@ -38,7 +38,7 @@ jobs:
           permission-pull-requests: 'write'
 
       - name: 'Checkout Code'
-        uses: 'actions/checkout@v4' # ratchet:exclude
+        uses: 'actions/checkout@v6' # ratchet:exclude
 
       - name: 'Run Gemini CLI'
         id: 'run_gemini'

.github/workflows/gemini-issue-fixer.yml

@@ -36,7 +36,7 @@ jobs:
           permission-pull-requests: 'write'
 
       - name: 'Checkout repository'
-        uses: 'actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8' # ratchet:actions/checkout@v6
+        uses: 'actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd' # ratchet:actions/checkout@v6
 
       - name: 'Run Gemini PR Create'
         uses: 'google-github-actions/run-gemini-cli@main' # ratchet:exclude

.github/workflows/gemini-plan-execute.yml

@@ -40,7 +40,7 @@ jobs:
           permission-pull-requests: 'write'
 
       - name: 'Checkout Code'
-        uses: 'actions/checkout@v4' # ratchet:exclude
+        uses: 'actions/checkout@v6' # ratchet:exclude
 
       - name: 'Run Gemini CLI'
         id: 'run_gemini'

.github/workflows/gemini-review.yml

@@ -39,7 +39,7 @@ jobs:
           permission-pull-requests: 'write'
 
       - name: 'Checkout repository'
-        uses: 'actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8' # ratchet:actions/checkout@v6
+        uses: 'actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd' # ratchet:actions/checkout@v6
 
       - name: 'Run Gemini pull request review'
         uses: 'google-github-actions/run-gemini-cli@main' # ratchet:exclude

.github/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: 'Checkout'
-        uses: 'actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8' # ratchet:actions/checkout@v6
+        uses: 'actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd' # ratchet:actions/checkout@v6
 
       - name: 'Publish'
         id: 'publish'