Update to Java 24 and add .java-version

.github/workflows/documentation.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4.7.0
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version-file: .java-version
           cache: 'maven'
       - name: Compile and Build OpenAPI file
         run: ./mvnw compile

.github/workflows/integration-tests.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version-file: .java-version
           cache: 'maven'
       - uses: aws-actions/configure-aws-credentials@b47578312673ae6fa5b5096b330d9fbac3d116df # v4.2.1
         name: Configure AWS credentials from Test account

.github/workflows/test.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container: ubuntu:22.04
+    container: ubuntu:24.04
     timeout-minutes: 20
 
     services:
@@ -21,11 +21,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      - name: Set up JDK 21
+      - name: Set up JDK
         uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4.7.0
         with:
           distribution: 'temurin'
-          java-version: 21
+          java-version-file: .java-version
           cache: 'maven'
         env:
           # work around an issue with actions/runner setting an incorrect HOME in containers, which breaks maven caching