build(deps): bump actions/cache from 2 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/deno-ci.yaml

@@ -31,7 +31,7 @@ jobs:
     # "https" cache: code from the Internet
     # External sources won't change much so we use less precise keys
     - name: Cache https://
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.cache/deno/deps/https
         key: deno-https/v1-${{ github.sha }}