Upgrade pitest-maven-plugin 1.7.6 -> 1.15.4

See:
- https://github.com/hcoles/pitest/releases/tag/1.15.4
- https://github.com/hcoles/pitest/releases/tag/1.15.3
- https://github.com/hcoles/pitest/releases/tag/1.15.2
- https://github.com/hcoles/pitest/releases/tag/1.15.1
- https://github.com/hcoles/pitest/releases/tag/1.15.0
- https://github.com/hcoles/pitest/releases/tag/1.14.4
- https://github.com/hcoles/pitest/releases/tag/1.14.3
- https://github.com/hcoles/pitest/releases/tag/1.14.2
- https://github.com/hcoles/pitest/releases/tag/1.14.1
- https://github.com/hcoles/pitest/releases/tag/1.14.0
- https://github.com/hcoles/pitest/releases/tag/1.13.2
- https://github.com/hcoles/pitest/releases/tag/1.13.1
- https://github.com/hcoles/pitest/releases/tag/1.13.0
- https://github.com/hcoles/pitest/releases/tag/1.12.0
- https://github.com/hcoles/pitest/releases/tag/1.11.7
- https://github.com/hcoles/pitest/releases/tag/1.11.6
- https://github.com/hcoles/pitest/releases/tag/1.11.5
- https://github.com/hcoles/pitest/releases/tag/1.11.4
- https://github.com/hcoles/pitest/releases/tag/1.11.3
- https://github.com/hcoles/pitest/releases/tag/1.11.2
- https://github.com/hcoles/pitest/releases/tag/1.11.1
- https://github.com/hcoles/pitest/releases/tag/1.11.0
- https://github.com/hcoles/pitest/releases/tag/1.10.4
- hcoles/pitest@1.10.2...1.10.3
- hcoles/pitest@1.10.1...1.10.2
- https://github.com/hcoles/pitest/releases/tag/1.10.1
- https://github.com/hcoles/pitest/releases/tag/1.10.0
- https://github.com/hcoles/pitest/releases/tag/1.9.11
- https://github.com/hcoles/pitest/releases/tag/1.9.10
- https://github.com/hcoles/pitest/releases/tag/1.9.9
- https://github.com/hcoles/pitest/releases/tag/1.9.8
- hcoles/pitest@1.9.6...1.9.7
- https://github.com/hcoles/pitest/releases/tag/1.9.6
- https://github.com/hcoles/pitest/releases/tag/1.9.5
- https://github.com/hcoles/pitest/releases/tag/1.9.4
- https://github.com/hcoles/pitest/releases/tag/1.9.3
- https://github.com/hcoles/pitest/releases/tag/1.9.2
- https://github.com/hcoles/pitest/releases/tag/1.9.1
- https://github.com/hcoles/pitest/releases/tag/1.9.0
- https://github.com/hcoles/pitest/releases/tag/1.8.1
- https://github.com/hcoles/pitest/releases/tag/1.8.0

pom.xml

@@ -768,7 +768,7 @@
                 <plugin>
                     <groupId>org.pitest</groupId>
                     <artifactId>pitest-maven</artifactId>
-                    <version>1.7.6</version>
+                    <version>1.15.4</version>
                     <configuration>
                         <mutators>
                             <mutator>ALL</mutator>