Bump actions/checkout from 2.3.5 to 2.4.0 (#1025)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.5...v2.4.0)

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

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

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

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: cache SBT
         uses: coursier/cache-action@v6
       - name: Java 11 setup
@@ -14,7 +14,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: cache SBT
         uses: coursier/cache-action@v6
       - name: java ${{matrix.java}} setup
@@ -34,7 +34,7 @@ jobs:
   test-coverage:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: cache SBT
         uses: coursier/cache-action@v6
       - name: java ${{matrix.java}} setup
@@ -45,7 +45,7 @@ jobs:
   mimaReport:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: cache SBT
         uses: coursier/cache-action@v6
       - name: java ${{matrix.java}} setup
@@ -65,7 +65,7 @@ jobs:
   microsite:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - name: Ruby setup
         uses: actions/[email protected]
         with:

.github/workflows/release.yml

@@ -7,7 +7,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.5
+      - uses: actions/checkout@v2.4.0
       - uses: olafurpg/setup-scala@v13
       - name: Publish ${{ github.ref }}
         run: sbt ci-release