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](actions/cache@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

@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Cache SpacemanDMM
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/SpacemanDMM
           key: ${{ runner.os }}-dreamchecker-${{ hashFiles('dependencies.sh')}}
@@ -61,7 +61,7 @@ jobs:
         run: |
           chmod -R +x ./tools/ci
       - name: Setup Cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: $HOME/BYOND
           key: ${{ runner.os }}-byond