Bump org.wildfly.arquillian:wildfly-arquillian-bom in /servlet-tck

Bumps [org.wildfly.arquillian:wildfly-arquillian-bom](https://github.com/wildfly/wildfly-arquillian) from 5.1.0.Beta7 to 5.1.0.Beta8.
- [Release notes](https://github.com/wildfly/wildfly-arquillian/releases)
- [Commits](wildfly/wildfly-arquillian@v5.1.0.Beta7...v5.1.0.Beta8)

---
updated-dependencies:
- dependency-name: org.wildfly.arquillian:wildfly-arquillian-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

servlet-tck/tck-runner/pom.xml

@@ -30,7 +30,7 @@
         <version.org.jboss.slf4j.slf4j-jboss-logging>1.2.1.Final</version.org.jboss.slf4j.slf4j-jboss-logging>
         <version.org.jboss.slf4j.slf4j-jboss-logmanager>2.0.1.Final</version.org.jboss.slf4j.slf4j-jboss-logmanager>
 
-        <version.org.wildfly.arquillian>5.1.0.Beta7</version.org.wildfly.arquillian>
+        <version.org.wildfly.arquillian>5.1.0.Beta8</version.org.wildfly.arquillian>
         <version.wildfly-maven-plugin>5.1.0.Final</version.wildfly-maven-plugin>
 
         <!-- Left blank to default to the latest version of WildFly -->