Bump actions/cache from 4 to 5 (#1047)

Bumps [actions/cache](https://github.com/actions/cache) from 4 to 5.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v4...v5)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Get cddl version
         run: curl -s https://crates.io/api/v1/crates/cddl | python3 -c "import sys, json; print(json.load(sys.stdin)['crate']['max_stable_version'])" | tee cddl.txt
       - name: "Cache rust binaries"
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         id: cache-cddl
         env:
           cache-name: cache-cddl