⬆️ Bump actions/cache/restore from 6.0.0 to 6.1.0

Bumps [actions/cache/restore](https://github.com/actions/cache) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@2c8a9bd...55cc834)

---
updated-dependencies:
- dependency-name: actions/cache/restore
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/asciidoctor-ghpages.yml

@@ -50,7 +50,7 @@ jobs:
         env:
           cache-name: cpm-cache-0
         id: cpm-cache-restore
-        uses: actions/cache/restore@2c8a9bd7457de244a408f35966fab2fb45fda9c8 # v6.0.0
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: ~/cpm-cache
           key: ${{runner.os}}-${{env.cache-name}}-${{ hashFiles('**/CMakeLists.txt', 'cmake/**') }}