chore(deps)(deps): bump actions/cache from 5 to 6 (#169)

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

@@ -85,7 +85,7 @@ jobs:
         # embedded Hyper instance inside the proc-macro host during clippy.
         # hyperd must be present or the proc-macro panics.
         id: hyperd-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .hyperd
           key: hyperd-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('hyperdb-bootstrap/hyperd-version.toml') }}
@@ -141,7 +141,7 @@ jobs:
         # (hyperdb-bootstrap/hyperd-version.toml) invalidates the cache
         # automatically and the next run re-downloads.
         id: hyperd-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .hyperd
           key: hyperd-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('hyperdb-bootstrap/hyperd-version.toml') }}
@@ -195,7 +195,7 @@ jobs:
           node-version: 20
       - name: Cache hyperd binary
         id: hyperd-cache
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: .hyperd
           key: hyperd-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('hyperdb-bootstrap/hyperd-version.toml') }}