Upgrade Quarkus

Based on a Quarkus project, newly generated with:

 mvn io.quarkus.platform:quarkus-maven-plugin:2.5.2.Final:create -DprojectGroupId=theodolite -DprojectArtifactId=theodolite -DclassName="org.acme.rest.GreetingResource" -Dpath="/theodolite" -Dextensions="kotlin,kubernetes-client" -DbuildTool=gradle

To Do:

• Check if paths in README are still valid

Will fix #215 (closed).

theodolite/gradle/wrapper/gradle-wrapper.properties

 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists