Bump actions/cache from 3 to 4

Bumps [actions/cache](https://github.com/actions/cache) from 3 to 4.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](https://github.com/actions/cache/compare/v3...v4)

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

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

.github/workflows/CI.yml

@@ -110,7 +110,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: "Cache conda"
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         env:
           CACHE_NUMBER: 0
         with: