build(deps): Update mill-contrib-testng from 0.11.9 to 0.11.12 #13759

Job	Run time
windows-latest jdk-17 unit tests 1 / 2	24m 38s
windows-latest jdk-17 unit tests 2 / 2	28m 18s
macOS-12 jdk-17 unit tests 1 / 2	36m 17s
macOS-12 jdk-17 unit tests 2 / 2	45m 9s
Gradle MacOS integration	15m 2s
ubuntu-latest jdk-17 unit tests 1 / 2	18m 51s
Sbt integration	47m 21s
ubuntu-latest jdk-17 unit tests 2 / 2	17m 24s
Maven integration	8m 22s
Gradle integration	9m 24s
Scala CLI integration	12m 33s
Mill integration	37m 41s
Bazel integration	11m 6s
LSP integration tests	34m 8s
Scala cross tests	35m 5s
Formatting	30s
Scalafix and docs	4m 52s
Sbt-metals/scripted jdk11	2m 33s
Scala javapc tests	1m 27s
Scala 2.11 cross tests	4m 9s
MiMa	54s
	6h 35m 44s

Provide feedback