chore(deps): Bump actions/cache from 3 to 4 (#965)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nightly.yml

@@ -45,7 +45,7 @@ jobs:
           registry: ghcr.io
           username: kluctlbot
           password: ${{ secrets.GHCR_TOKEN }}
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod

.github/workflows/preview-run.yml

@@ -26,7 +26,7 @@ jobs:
           node-version: 20
           cache: 'npm'
           cache-dependency-path: pkg/webui/ui/package-lock.json
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod

.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
           registry: ghcr.io
           username: kluctlbot
           password: ${{ secrets.GHCR_TOKEN }}
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod

.github/workflows/tests.yml

@@ -25,7 +25,7 @@ jobs:
           node-version: 20
           cache: 'npm'
           cache-dependency-path: pkg/webui/ui/package-lock.json
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod
@@ -123,7 +123,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.21'
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod
@@ -188,7 +188,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.21'
-      - uses: actions/cache@v3
+      - uses: actions/cache@v4
         with:
           path: |
             ~/go/pkg/mod