ci(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
         # would require WSL action + script rewrites; tracked as follow-up.
         os: [ubuntu-latest, macos-14]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Set up Python 3.12
         uses: actions/setup-python@v6
@@ -119,7 +119,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Set up Python 3.12
         uses: actions/setup-python@v6
@@ -458,7 +458,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 2
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Count agents
         run: |
           TOTAL=$(find plugins/preview-forge/agents -name "*.md" -type f | wc -l)
@@ -544,7 +544,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 2
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Install shellcheck
         run: sudo apt-get update && sudo apt-get install -y shellcheck
       - name: Lint bin/pf + verify-plugin.sh
@@ -559,7 +559,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 6
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: actions/setup-python@v6
         with:

.github/workflows/marketplace-validate.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 3
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"

.github/workflows/pages.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 3
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: Assemble site
         run: |

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 5
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0