Bump actions/cache from 3 to 4 (#296)

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/deploy-website.yml

@@ -60,7 +60,7 @@ jobs:
         id: pages
         uses: actions/configure-pages@v4
       - name: Restore cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             docs/build

.github/workflows/formatter.yml

@@ -24,7 +24,7 @@ jobs:
           ref: ${{ github.head_ref }}
 
       - name: Cache .NET tools
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.nuget/packages
           key: dotnet-tools-${{ runner.os }}-${{ hashFiles('.config/dotnet-tools.json') }}