Update dependency io.gatling:gatling-maven-plugin to v4.15.1 (#254)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

performance-tests/pom.xml

@@ -31,7 +31,7 @@
             <plugin>
                 <groupId>io.gatling</groupId>
                 <artifactId>gatling-maven-plugin</artifactId>
-                <version>4.14.0</version>
+                <version>4.15.1</version>
                 <configuration>
                     <runMultipleSimulations>true</runMultipleSimulations>
                     <simulationClass>pl.piomin.samples.quarkus.performance.EmployeeQueryTest</simulationClass>