fix: remove unused packages

Author: acke

plugin/META-INF/MANIFEST.MF

@@ -25,9 +25,7 @@ Require-Bundle: org.eclipse.ui,
  org.eclipse.ui.genericeditor,
  org.eclipse.swt,
  org.eclipse.jface,
- com.google.gson;bundle-version="2.11.0",
- org.junit,
- junit-jupiter-api
+ com.google.gson;bundle-version="2.11.0"
 Automatic-Module-Name: io.snyk.eclipse.plugin.tests
 Bundle-ActivationPolicy: lazy
 Bundle-ClassPath: .,