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] <[email protected]>

.github/workflows/main.yml

@@ -78,7 +78,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Cache Docker layers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-build-x-${{ matrix.arch }}-${{ github.sha }}
@@ -133,7 +133,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Cache Docker layers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-build-x-multi-${{ github.sha }}

.github/workflows/nightly.yml

@@ -75,7 +75,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Cache Docker layers
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: /tmp/.buildx-cache
           key: ${{ runner.os }}-build-x-${{ matrix.arch }}-${{ github.sha }}

.github/workflows/publish-to-ghcr.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
     - name: Cache Docker layers
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: /tmp/.buildx-cache
         key: ${{ runner.os }}-build-x-${{ github.sha }}