Bump actions/setup-java from 4.1.0 to 4.2.1 (exercism#2751)

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 4.1.0 to 4.2.1.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@9704b39...99b8673)

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

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

Author: dependabot[bot]

.github/workflows/java.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       - name: Set up JDK 1.17
-        uses: actions/setup-java@9704b39bf258b59bc04b50fa2dd55e9ed76b47a8
+        uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9
         with:
           java-version: 17
           distribution: "temurin"
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
       - name: Set up JDK 1.17
-        uses: actions/setup-java@9704b39bf258b59bc04b50fa2dd55e9ed76b47a8
+        uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9
         with:
           java-version: 17
           distribution: "temurin"