Revert "Bump org-aspectj from 1.9.20.1 to 1.9.21.1"

This reverts commit a0b1d6317ce169cbcd17abc99fa66acfc2729e89.

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ io-rsocket = "1.1.4"
 io-spring-javaformat = "0.0.41"
 io-spring-nohttp = "0.0.11"
 org-apache-directory-server = "1.5.5"
-org-aspectj = "1.9.21.1"
+org-aspectj = "1.9.20.1"
 org-bouncycastle = "1.70"
 org-eclipse-jetty = "9.4.54.v20240208"
 org-jetbrains-kotlin = "1.7.22"