Bump actions/checkout from 2 to 3 (#376)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/snapshot.yml

@@ -17,7 +17,7 @@ jobs:
     name: Publish snapshots
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 10000
        # Fetch all tags so that sbt-dynver can find the previous release version

.github/workflows/test.yml

@@ -21,14 +21,14 @@ jobs:
     name: code format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: scalafmt test
         run: ./sbt scalafmtCheckAll
   test:
     name: test jdk11
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: olafurpg/setup-scala@v10
         with:
           java-version: adopt@1.11
@@ -43,7 +43,7 @@ jobs:
     name: test jdk8
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: olafurpg/setup-scala@v10
         with:
           java-version: adopt@1.8
@@ -58,7 +58,7 @@ jobs:
     name: test jdk17
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - uses: olafurpg/setup-scala@v10
       with:
         java-version: 17