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](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/_build-rust.yml

@@ -69,7 +69,7 @@ jobs:
           targets: ${{ inputs.rust-target }}
           components: clippy, rustfmt
       - name: Set up cargo cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         continue-on-error: false
         with:
           path: |

.github/workflows/integrationtest.yml

@@ -30,7 +30,7 @@ jobs:
           nix_path: nixpkgs=channel:nixos-23.05
       - uses: DeterminateSystems/magic-nix-cache-action@main
       - name: Set up cargo cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         continue-on-error: false
         with:
           path: |