chore(deps): bump actions/cache from 5 to 6 (#50)

Bumps [actions/cache](https://github.com/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](actions/cache@v5...v6)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
         with:
           node-version: "22"
 
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: ~/.npm
           key: npm-markdownlint-${{ runner.os }}-${{ hashFiles('.markdownlint-cli2.yaml') }}
@@ -150,7 +150,7 @@ jobs:
         run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
         shell: bash
 
-      - uses: actions/cache@v5
+      - uses: actions/cache@v6
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}
           key: yarn-${{ runner.os }}-${{ hashFiles('submodules/harbour-credentials/src/typescript/harbour/yarn.lock') }}