Bump olafurpg/setup-scala from 10 to 12

Bumps [olafurpg/setup-scala](https://github.com/olafurpg/setup-scala) from 10 to 12.
- [Release notes](https://github.com/olafurpg/setup-scala/releases)
- [Commits](https://github.com/olafurpg/setup-scala/compare/v10...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>

.github/workflows/ci.yml

@@ -70,7 +70,7 @@ jobs:
         ref: develop
         path: zinc
     - name: Setup
-      uses: olafurpg/setup-scala@v10
+      uses: olafurpg/setup-scala@v12
       with:
         java-version: "adopt@1.${{ matrix.java }}"
     - name: Set up Python 3.7

.github/workflows/nightly.yml

@@ -36,7 +36,7 @@ jobs:
         ref: develop
         path: zinc
     - name: Setup
-      uses: olafurpg/setup-scala@v10
+      uses: olafurpg/setup-scala@v12
       with:
         java-version: "adopt@1.${{ matrix.java }}"
     - name: Coursier cache