deps: bump aspectj to 1.9.21 for jdk21 (#1536)

Author: jeromevdl

docs/index.md

@@ -306,9 +306,6 @@ Use the following [dependency matrix](https://github.com/eclipse-aspectj/aspectj
 | `11-17`     | `1.9.20.1`      |
 | `21`        | `1.9.21`        |
 
-_Note: 1.9.21 is not yet available and Java 21 not yet officially supported by aspectj, but you can already use the `1.9.21.M1`_
-
-
 ## Environment variables
 
 !!! info

powertools-e2e-tests/handlers/pom.xml

@@ -205,7 +205,7 @@
                 <jdk>[21,)</jdk>
             </activation>
             <properties>
-                <aspectj.version>1.9.21.M1</aspectj.version>
+                <aspectj.version>1.9.21</aspectj.version>
             </properties>
         </profile>
     </profiles>