build(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](https://github.com/actions/checkout/compare/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>

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       contents: read
       pull-requests: read
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - name: Gitleaks
@@ -42,14 +42,14 @@ jobs:
     name: Dockerfile Package Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - run: bash scripts/check-dockerfiles.sh
 
   openspec:
     name: OpenSpec Validate
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -62,7 +62,7 @@ jobs:
     name: Typecheck
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -75,7 +75,7 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -88,7 +88,7 @@ jobs:
     name: Unit Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -101,7 +101,7 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -117,7 +117,7 @@ jobs:
       contents: read
       pull-requests: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with:
@@ -183,7 +183,7 @@ jobs:
     env:
       DATABASE_URL: postgres://trails:trails@localhost:5432/trails
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: pnpm/action-setup@v6
       - uses: actions/setup-node@v6
         with: