Upgrade to Java 17 and align all JUnit deps to 6.x

- Bump sourceCompatibility/targetCompatibility from Java 8 to 17
- Bump junit-jupiter-api and junit-jupiter-engine to 6.1.1 (match platform-launcher)
- Update pom.xml java.version, junit-version, and junit-platform-runner.version
- Bump google-java-format from 1.8 to 1.22.0 (Java 17 compat)

Author: kwent

build.gradle

@@ -83,8 +83,8 @@ if(hasProperty('target') && target == 'android') {
     apply plugin: 'java'
     apply plugin: 'maven-publish'
 
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 
     publishing {
         publications {
@@ -116,9 +116,9 @@ dependencies {
     implementation 'org.openapitools:jackson-databind-nullable:0.2.10'
     implementation group: 'org.apache.commons', name: 'commons-lang3', version: '3.20.0'
     implementation "jakarta.annotation:jakarta.annotation-api:$jakarta_annotation_version"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.14.4'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:6.1.1'
     testImplementation 'org.mockito:mockito-core:5.23.0'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.14.4'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:6.1.1'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher:6.1.1'
 }
 
@@ -146,7 +146,7 @@ spotless {
         // don't need to set target, it is inferred from java
 
         // apply a specific flavor of google-java-format
-        googleJavaFormat('1.8').aosp().reflowLongStrings()
+        googleJavaFormat('1.22.0').aosp().reflowLongStrings()
 
         removeUnusedImports()
         importOrder()

pom.xml

@@ -338,7 +338,7 @@
         </dependency>
     </dependencies>
     <properties>
-        <java.version>1.8</java.version>
+        <java.version>17</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
         <gson-fire-version>1.9.0</gson-fire-version>
@@ -348,8 +348,8 @@
         <jackson-databind-nullable-version>0.2.10</jackson-databind-nullable-version>
         <jakarta-annotation-version>3.0.0</jakarta-annotation-version>
         <beanvalidation-version>2.0.2</beanvalidation-version>
-        <junit-version>5.14.4</junit-version>
-        <junit-platform-runner.version>1.14.4</junit-platform-runner.version>
+        <junit-version>6.1.1</junit-version>
+        <junit-platform-runner.version>6.1.1</junit-platform-runner.version>
         <jakarta.ws.rs-api-version>4.0.0</jakarta.ws.rs-api-version>
         <jsr311-api-version>1.1.1</jsr311-api-version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>