Bump pitest-maven from 1.6.2 to 1.6.4

Bumps [pitest-maven](https://github.com/hcoles/pitest) from 1.6.2 to 1.6.4.
- [Release notes](https://github.com/hcoles/pitest/releases)
- [Commits](hcoles/pitest@1.6.2...1.6.4)

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -28,7 +28,7 @@
       <plugin>
         <groupId>org.pitest</groupId>
         <artifactId>pitest-maven</artifactId>
-        <version>1.6.2</version>
+        <version>1.6.4</version>
         <configuration>
           <timeoutConstant>8000</timeoutConstant>
           <threads>8</threads>
@@ -212,7 +212,7 @@
     <dependency>
       <groupId>org.apache.velocity</groupId>
       <artifactId>velocity-engine-core</artifactId>
-      <version>2.2</version>
+      <version>2.3</version>
     </dependency>
   </dependencies>
   <!-- To be able to use the latest version/release candidate -->