Bump org.apache.ant:ant-junit from 1.10.6 to 1.10.15

Bumps org.apache.ant:ant-junit from 1.10.6 to 1.10.15.

---
updated-dependencies:
- dependency-name: org.apache.ant:ant-junit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -90,7 +90,7 @@ configurations {
 
 dependencies {
     mps "com.jetbrains:mps:$mpsVersion"
-    antLib "org.apache.ant:ant-junit:1.10.6"
+    antLib "org.apache.ant:ant-junit:1.10.15"
 }
 
 repositories {