Bump actions/upload-artifact from 2 to 3

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v2...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
           mkdir -p cache
           docker save dockcross/base:latest | xz -e9 -T0 > ./cache/base.tar.xz
       - name: save base
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: cache
           path: ./cache