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/commit.yml

@@ -59,7 +59,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: restore_cache
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         key: regression-cache-{{ checksum "tests/regression/data.c" }}-v0
         path: tests/regression/cache

.github/workflows/nightly.yml

@@ -18,7 +18,7 @@ jobs:
       CIRCLE_ARTIFACTS: "/tmp/circleci-artifacts"
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         key: regression-cache-{{ checksum "tests/regression/data.c" }}-v0
         path: tests/regression/cache