Bump actions/cache from 2 to 3 (#49)

Bumps [actions/cache](https://github.com/actions/cache) from 2 to 3.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v2...v3)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -81,15 +81,15 @@ jobs:
       - name: Restore MinGW-W64 (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-mingw-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: external/mingw-${{ matrix.target.cpu }}
           key: 'mingw-${{ matrix.target.cpu }}'
 
       - name: Restore Nim DLLs dependencies (Windows) from cache
         if: runner.os == 'Windows'
         id: windows-dlls-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: external/dlls-${{ matrix.target.cpu }}
           key: 'dlls-${{ matrix.target.cpu }}'
@@ -135,7 +135,7 @@ jobs:
           steps.nim-compiler-cache.outputs.cache-hit != 'true' &&
           matrix.target.nim_branch != 'devel'
         id: nim-compiler-cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: '${{ github.workspace }}/nim-${{ matrix.target.nim_branch }}-${{ matrix.target.cpu }}'
           key: 'nim-${{ matrix.target.cpu }}-${{ matrix.target.nim_branch }}'