Bump the ci-dependencies group across 1 directory with 4 updates

Bumps the ci-dependencies group with 4 updates in the / directory: [actions/checkout](https://github.com/actions/checkout), [actions/setup-node](https://github.com/actions/setup-node), [actions/cache](https://github.com/actions/cache) and [rlespinasse/github-slug-action](https://github.com/rlespinasse/github-slug-action).


Updates `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)

Updates `actions/setup-node` from 6 to 7
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v6...v7)

Updates `actions/cache` from 5 to 6
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v5...v6)

Updates `rlespinasse/github-slug-action` from 5.6.0 to 5.7.0
- [Release notes](https://github.com/rlespinasse/github-slug-action/releases)
- [Commits](https://github.com/rlespinasse/github-slug-action/compare/v5.6.0...v5.7.0)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci-dependencies
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci-dependencies
- dependency-name: actions/setup-node
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci-dependencies
- dependency-name: rlespinasse/github-slug-action
  dependency-version: 5.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci-dependencies
...

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

.github/workflows/deploy-v5.yaml

@@ -16,17 +16,17 @@ jobs:
     runs-on: ubuntu-latest
     name: Deploy v5 to Cloudflare Pages
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
 
       - name: Setup Node
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: 24
 
       - name: Cache dependencies
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.npm
           key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
@@ -34,7 +34,7 @@ jobs:
             ${{ runner.os }}-node-
 
       - name: Cache Quartz plugins
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .quartz/plugins
           key: ${{ runner.os }}-plugins-${{ hashFiles('quartz.lock.json') }}