Update actions/setup-java to v4

Closes gh-6

Author: sjohnr

README.md

@@ -2,7 +2,7 @@
 
 A composite action that combines the following steps:
 
-* Set up a JDK with `actions/setup-java@v3`
+* Set up a JDK with `actions/setup-java@v4`
 * Set up a `user.name` system property with `spring-builds+github`
 * Validate the Gradle wrapper using `gradle/wrapper-validation-action@v1`
 * Set up Gradle using `gradle/gradle-build-action@v2`

action.yml

@@ -16,7 +16,7 @@ runs:
   using: 'composite'
   steps:
     - name: Set up JDK ${{ inputs.java-version }}
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         java-version: ${{ inputs.java-version }}
         distribution: ${{ inputs.distribution }}