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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
                   echo "vcs_cache=$(composer config cache-vcs-dir)" >> $GITHUB_OUTPUT
 
             - name: Retrieve cached packages
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: |
                     ${{ steps.composer-cache.outputs.files_cache }}
@@ -41,7 +41,7 @@ jobs:
             # but will restore the cache generated during the previous run
             # based on partial match
             - name: Retrieve Psalm's cache
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   # we really need a way for Psalm to tell where cache is located
                   path: |
@@ -81,7 +81,7 @@ jobs:
                   echo "vcs_cache=$(composer config cache-vcs-dir)" >> $GITHUB_OUTPUT
 
             - name: Retrieve cached packages
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: |
                     ${{ steps.composer-cache.outputs.files_cache }}
@@ -127,7 +127,7 @@ jobs:
                   echo "vcs_cache=$(composer config cache-vcs-dir)" >> $GITHUB_OUTPUT
 
             - name: Retrieve cached packages
-              uses: actions/cache@v3
+              uses: actions/cache@v4
               with:
                   path: |
                     ${{ steps.composer-cache.outputs.files_cache }}