[groovyscripting] Update Groovy to 4.0.9 and support slurpers (#14499)

Updates Groovy from 4.0.7 to 4.0.9.

For release notes, see:

https://groovy-lang.org/changelogs/changelog-4.0.8.html
https://groovy-lang.org/changelogs/changelog-4.0.9.html

Adds dependencies and service loader config so JSON, XML and YAML can be more easily parsed using the JsonSlurper, XmlSlurper and YamlSlurper.

Signed-off-by: Wouter Born <github@maindrain.net>

itests/pom.xml

@@ -17,6 +17,7 @@
   <name>openHAB Add-ons :: Integration Tests</name>
 
   <modules>
+    <module>org.openhab.automation.groovyscripting.tests</module>
     <module>org.openhab.automation.jsscriptingnashorn.tests</module>
     <module>org.openhab.binding.astro.tests</module>
     <module>org.openhab.binding.avmfritz.tests</module>