Update dependency org.testng:testng to v7.12.0

Author: renovate[bot]

project/pom.xml

@@ -196,7 +196,7 @@
     <osgi.version>6.0.0</osgi.version>
 
     <!-- Test dependency versions -->
-    <testng.version>7.5.1</testng.version>
+    <testng.version>7.12.0</testng.version>
     <xmlunit.version>1.6</xmlunit.version>
     <assertj-core.version>3.23.1</assertj-core.version>
     <assertj-guava.version>1.3.0</assertj-guava.version>