build(deps): bump actions/cache in the github-actions group

Bumps the github-actions group with 1 update: [actions/cache](https://github.com/actions/cache).


Updates `actions/cache` from 5.0.5 to 6.0.0
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@27d5ce7...2c8a9bd)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/och-self-scan.yml

@@ -31,7 +31,7 @@ jobs:
       - uses: jdx/mise-action@e6a8b3978addb5a52f2b4cd9d91eafa7f0ab959d  # v4
 
       - name: Cache pnpm store
-        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae  # v5.0.5
+        uses: actions/cache@2c8a9bd7457de244a408f35966fab2fb45fda9c8  # v6.0.0
         with:
           path: ~/.local/share/pnpm/store
           key: pnpm-store-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}