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/test-cache.yml

@@ -47,7 +47,7 @@ jobs:
           SEMVER_CHECKS=$(cargo semver-checks --version | sed -e 's/\s\+/-/g')
           echo "KEY=testprefix-testkey-linux-$RUSTC-$SEMVER_CHECKS-d41d8cd98f00b204e9800998ecf8427e-semver-checks-rustdoc" >> $GITHUB_OUTPUT
       - name: Download saved cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: ${{ github.workspace }}/semver-checks/target/semver-checks/cache
           fail-on-cache-miss: true
@@ -97,7 +97,7 @@ jobs:
           SEMVER_CHECKS=$(cargo semver-checks --version | sed -e 's/\s\+/-/g')
           echo "KEY=testprefix-test-cache-exists-default-d45618ed191f0a73-linux-$RUSTC-$SEMVER_CHECKS-d41d8cd98f00b204e9800998ecf8427e-semver-checks-rustdoc" >> $GITHUB_OUTPUT
       - name: Download saved cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: ${{ github.workspace }}/semver-checks/target/semver-checks/cache
           fail-on-cache-miss: true

.github/workflows/test-inputs.yml

@@ -280,7 +280,7 @@ jobs:
         with:
           rust-toolchain: nightly
       - name: Get cache key
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         id: get-cache-key
         with:
           path: ${{ github.workspace }}/semver-checks/target/semver-checks/cache
@@ -323,7 +323,7 @@ jobs:
         with:
           rust-toolchain: nightly
       - name: Get cache key
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         id: get-cache-key
         with:
           path: ${{ github.workspace }}/semver-checks/target/semver-checks/cache
@@ -366,7 +366,7 @@ jobs:
         with:
           rust-toolchain: manual
       - name: Get cache key
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         id: get-cache-key
         with:
           path: ${{ github.workspace }}/semver-checks/target/semver-checks/cache