Bump org.pitest:pitest-maven from 1.20.6 to 1.21.0 (#638)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -226,7 +226,7 @@
         <plugin>
           <groupId>org.pitest</groupId>
           <artifactId>pitest-maven</artifactId>
-          <version>1.20.6</version>
+          <version>1.21.0</version>
         </plugin>
         <plugin>
           <groupId>com.github.spotbugs</groupId>