chore(deps): update actions/cache action to v6 (#65)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://github.com/actions/cache) | action | major | `v5.1.0` → `v6.1.0` |

---

### Release Notes

<details>
<summary>actions/cache (actions/cache)</summary>

### [`v6.1.0`](https://github.com/actions/cache/releases/tag/v6.1.0)

[Compare Source](https://github.com/actions/cache/compare/v6.0.0...v6.1.0)

##### What's Changed

- Bump [@&#8203;actions/cache](https://github.com/actions/cache) to v6.1.0 - handle read-only cache access by [@&#8203;jasongin](https://github.com/jasongin) in [#&#8203;1768](https://github.com/actions/cache/pull/1768)

**Full Changelog**: <https://github.com/actions/cache/compare/v6...v6.1.0>

### [`v6.0.0`](https://github.com/actions/cache/releases/tag/v6.0.0)

[Compare Source](https://github.com/actions/cache/compare/v6.0.0...v6.0.0)

##### What's Changed

- Update packages, migrate to ESM by [@&#8203;Samirat](https://github.com/Samirat) in [#&#8203;1760](https://github.com/actions/cache/pull/1760)

**Full Changelog**: <https://github.com/actions/cache/compare/v5...v6.0.0>

### [`v6`](https://github.com/actions/cache/compare/v5.1.0...v6.0.0)

[Compare Source](https://github.com/actions/cache/compare/v5.1.0...v6.0.0)

</details>

---

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---

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---

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Reviewed-on: #65
Reviewed-by: t.behrendt <2+t.behrendt@noreply.localhost>
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

setup-osv/action.yaml

@@ -65,7 +65,7 @@ runs:
         echo "VERSION=${VERSION}" >> "$GITHUB_OUTPUT"
     - name: Cache osv-scanner binary
       id: cache-osv
-      uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
+      uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
       with:
         path: /usr/local/bin/osv-scanner
         key: osv-scanner-${{ steps.arch.outputs.version }}-${{ steps.arch.outputs.arch }}-${{ steps.arch.outputs.digest }}