Bump actions/checkout from 2 to 3

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

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         SCALA: [2.12.16, 2.13.6]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: coursier/cache-action@v6
     - uses: laughedelic/coursier-setup@v1
       with:
@@ -30,7 +30,7 @@ jobs:
     if: github.event_name == 'push'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: coursier/cache-action@v6
     - uses: laughedelic/coursier-setup@v1
       with: