[bugfix] AspectJ seems to have problems with generating code for Java 17

Author: adamretter

exist-core/pom.xml

@@ -1027,7 +1027,7 @@ The BaseX Team. The original license statement is also included below.]]></pream
                         <configuration>
                             <forceAjcCompile>true</forceAjcCompile>  <!-- Required, otherwise the Aspects are not re-compiled when the src/main/java is recompiled for the test phase -->
                             <showWeaveInfo>true</showWeaveInfo>
-                            <complianceLevel>${project.build.source}</complianceLevel>
+                            <complianceLevel>8</complianceLevel>
                             <source>${project.build.source}</source>
                             <target>${project.build.target}</target>
                             <!-- sources>