Update AspectJ Compiler to 1.9.21 to support Java 21

Author: slachiewicz

plexus-compilers/plexus-compiler-aspectj/pom.xml

@@ -14,7 +14,7 @@
   <description>AspectJ Compiler support for Plexus Compiler component.</description>
 
   <properties>
-    <javaVersion>11</javaVersion>
+    <javaVersion>17</javaVersion>
   </properties>
 
   <dependencies>

pom.xml

@@ -46,7 +46,7 @@
     <redirectTestOutputToFile>true</redirectTestOutputToFile>
     <project.build.outputTimestamp>2022-12-17T17:23:49Z</project.build.outputTimestamp>
     <jupiter.version>5.10.1</jupiter.version>
-    <aspectj.version>1.9.19</aspectj.version>
+    <aspectj.version>1.9.21</aspectj.version>
     <maven.version>3.5.4</maven.version>
     <errorprone.version>2.23.0</errorprone.version>
     <trimStackTrace>false</trimStackTrace>