Add missing package dependency to org.junit.runners.model

b9d2926d missed to add this dependency used in
SeparateClassloaderTestRunner which broke the build in Eclipse.

Change-Id: I7ef79021ad41cabc9f2fa10ac6916eed2745d2c6
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.junit/META-INF/MANIFEST.MF

@@ -28,6 +28,7 @@ Import-Package: org.eclipse.jgit.annotations;version="[5.5.0,5.6.0)",
  org.junit;version="[4.12,5.0.0)",
  org.junit.rules;version="[4.12,5.0.0)",
  org.junit.runner;version="[4.12,5.0.0)",
+ org.junit.runners;version="[4.12,5.0.0)",
  org.junit.runners.model;version="[4.12,5.0.0)",
  org.slf4j;version="[1.7.0,2.0.0)"
 Export-Package: org.eclipse.jgit.junit;version="5.5.0";