Update junit-platform-testkit to 1.13.1 and include in Dependabot

Author: gsmet

.github/dependabot.yml

@@ -75,6 +75,7 @@ updates:
       - dependency-name: org.hamcrest:hamcrest
       - dependency-name: org.junit:junit-bom
       - dependency-name: org.junit.jupiter:*
+      - dependency-name: org.junit.platform:*
       - dependency-name: org.assertj:assertj-core
       - dependency-name: org.testcontainers:*
       - dependency-name: org.mockito:*

independent-projects/junit5-virtual-threads/pom.xml

@@ -44,7 +44,7 @@
         <jandex.version>3.3.1</jandex.version>
 
         <junit5.version>5.13.1</junit5.version>
-        <junit.testkit.version>1.10.3</junit.testkit.version>
+        <junit.testkit.version>1.13.1</junit.testkit.version>
         <assertj.version>3.27.3</assertj.version>
     </properties>