Upgrade pitest-maven-plugin 1.9.9 -> 1.9.10 (#344)

See:
- https://github.com/hcoles/pitest/releases/tag/1.9.10
- hcoles/pitest@1.9.9...1.9.10

pom.xml

@@ -1265,7 +1265,7 @@
                 <plugin>
                     <groupId>org.pitest</groupId>
                     <artifactId>pitest-maven</artifactId>
-                    <version>1.9.9</version>
+                    <version>1.9.10</version>
                     <configuration>
                         <excludedClasses>
                             <excludedClass>*.AutoValue_*</excludedClass>