Use Java 8 release baseline when building with newer JDKs.

mp911de · mp911de · commit b47e5ff71eca · 2022-03-15T14:00:29.000+01:00
Closes #1667
diff --git a/parent/pom.xml b/parent/pom.xml
@@ -215,6 +215,7 @@
 			<properties>
 				<jaxb.version>2.2.11</jaxb.version>
 				<java-activation.version>1.1.1</java-activation.version>
+				<maven.compiler.release>8</maven.compiler.release>
 			</properties>
 
 			<activation>
