Bump olafurpg/setup-scala from 11 to 12 (scalacenter#189)

Bumps [olafurpg/setup-scala](https://github.com/olafurpg/setup-scala) from 11 to 12.
- [Release notes](https://github.com/olafurpg/setup-scala/releases)
- [Commits](olafurpg/setup-scala@v11...v12)

---
updated-dependencies:
- dependency-name: olafurpg/setup-scala
  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/ci.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2.3.4
-      - uses: olafurpg/setup-scala@v11
+      - uses: olafurpg/setup-scala@v12
       - uses: coursier/cache-action@v6
       - name: Lint
         run: sbt scalafmtCheckAll "rules2_12/scalafix --check"

.github/workflows/release.yaml

@@ -11,7 +11,7 @@ jobs:
         with:
           # Fetch all tags to help sbt-ci-release infer the snapshot version.
           fetch-depth: 0
-      - uses: olafurpg/setup-scala@v11
+      - uses: olafurpg/setup-scala@v12
       - uses: coursier/cache-action@v6
       - name: Test
         run: sbt scalafmtCheck "rules/scalafix --check" +test