Bump slf4j-simple from 2.0.0-alpha0 to 2.0.0-alpha6

Bumps [slf4j-simple](https://github.com/qos-ch/slf4j) from 2.0.0-alpha0 to 2.0.0-alpha6.
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](https://github.com/qos-ch/slf4j/commits/v_2.0.0-alpha6)

---
updated-dependencies:
- dependency-name: org.slf4j:slf4j-simple
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

apm-agent-plugins/apm-servlet-jakarta-test/pom.xml

@@ -67,7 +67,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
-            <version>2.0.0-alpha0</version>
+            <version>2.0.0-alpha6</version>
         </dependency>
     </dependencies>
 </project>