Explicitly set release=8 in base-compile execution for clarity

Co-authored-by: slachiewicz <[email protected]>

Author: Copilot

pom.xml

@@ -93,6 +93,7 @@
             </goals>
             <!-- recompile everything for target VM except the module-info.java -->
             <configuration>
+              <release>8</release>
               <excludes>
                 <exclude>module-info.java</exclude>
               </excludes>