chore: add source/target java version to maven-compiler-plugin configuration

Author: vlsi

pgjdbc-versions/pom.xml

@@ -154,6 +154,10 @@
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.3</version>
+                    <configuration>
+                        <source>${javac.target}</source>
+                        <target>${javac.target}</target>
+                    </configuration>
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>