Merge pull request scala#5849 from lrytz/partest-1.1.1

Use partest 1.1.1

Author: lrytz

versions.properties

@@ -19,6 +19,6 @@ scala.binary.version=2.12
 #  - jline: shaded with JarJar and included in scala-compiler
 #  - partest: used for running the tests
 scala-xml.version.number=1.0.6
-partest.version.number=1.1.0
+partest.version.number=1.1.1
 scala-asm.version=5.1.0-scala-2
 jline.version=2.14.3