Bump loadGeneratorVersion from 1.0.5 to 3.1.0

Bumps `loadGeneratorVersion` from 1.0.5 to 3.1.0.

Updates `jetty-load-generator-starter` from 1.0.5 to 3.1.0
- [Release notes](https://github.com/jetty-project/jetty-load-generator/releases)
- [Commits](jetty-project/jetty-load-generator@jetty-load-generator-1.0.5...3.1.0)

Updates `jetty-load-generator-client` from 1.0.5 to 3.1.0
- [Release notes](https://github.com/jetty-project/jetty-load-generator/releases)
- [Commits](jetty-project/jetty-load-generator@jetty-load-generator-1.0.5...3.1.0)

---
updated-dependencies:
- dependency-name: org.mortbay.jetty.loadgenerator:jetty-load-generator-starter
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.mortbay.jetty.loadgenerator:jetty-load-generator-client
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pom.xml

@@ -11,7 +11,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <loadGeneratorVersion>1.0.5</loadGeneratorVersion>
+    <loadGeneratorVersion>3.1.0</loadGeneratorVersion>
 <!--    <loadGeneratorVersion>1.0.2</loadGeneratorVersion>-->
     <jetty.version>9.4.35.v20201120</jetty.version>
     <snapshotDeploy.id>oss.sonatype.org</snapshotDeploy.id>
@@ -114,7 +114,7 @@
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
-        <version>1.7.30</version>
+        <version>1.7.31</version>
       </dependency>
       <dependency>
         <groupId>org.apache.logging.log4j</groupId>