Add nullability annotations to tests in module/spring-boot-jooq-test

See gh-47263

module/spring-boot-jooq-test/build.gradle

@@ -40,3 +40,7 @@ dependencies {
 	testRuntimeOnly("com.h2database:h2")
 	testRuntimeOnly("org.hsqldb:hsqldb")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}