chore(deps): update dependency org.pitest:pitest-maven to v1.21.0

Author: renovate[bot]

pom.xml

@@ -448,7 +448,7 @@
           <plugin>
             <groupId>org.pitest</groupId>
             <artifactId>pitest-maven</artifactId>
-            <version>1.20.7</version>
+            <version>1.21.0</version>
             <executions>
               <execution>
                 <goals>