Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -9,14 +9,14 @@ jobs:
     name: JDK8 tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
       - run: sbt test scripted
   jdk11:
     name: JDK11 tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
         with:
           java-version: adopt@1.11
@@ -25,7 +25,7 @@ jobs:
     name: JDK17 tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
         with:
           java-version: 17
@@ -34,14 +34,14 @@ jobs:
     name: Windows tests
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
       - run: sbt ci-windows
         shell: bash
   checks:
     name: Scalafmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
       - run: ./bin/scalafmt --test

.github/workflows/release.yml

@@ -7,7 +7,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: olafurpg/setup-scala@v14
       - uses: olafurpg/setup-gpg@v3
       - run: git fetch --unshallow