build(deps): 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/linux.yml

@@ -41,7 +41,7 @@ jobs:
 
       - name: Cache GTest
         id: cache-gtest
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: gtest/
           key: ${{runner.os}}-gtest-1.11

.github/workflows/windows.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Cache GTest
         id: cache-gtest
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: gtest/
           key: ${{runner.os}}-gtest-1.11-${{matrix.lib}}-${{matrix.arch}}-${{matrix.build_type}}
@@ -67,7 +67,7 @@ jobs:
 
       - name: Cache gflags
         id: cache-gflags
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: gflags/
           key: ${{runner.os}}-gflags-2.2.2-${{matrix.lib}}-${{matrix.arch}}-${{matrix.build_type}}