add sloeber plugins to required plugins :-S

Author: jan

io.sloeber.product/META-INF/MANIFEST.MF

@@ -9,7 +9,9 @@ Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.ui.editors,
  org.eclipse.ui.ide,
  org.eclipse.platform,
- org.eclipse.ui.intro
+ org.eclipse.ui.intro,
+ io.sloeber.ui,
+ io.sloeber.core
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Bundle-Vendor: baeyens.it
 Automatic-Module-Name: io.sloeber.product