added dependencies to p2 repos and switched to more tight dependency declarations

eclipse-language-servers/org.springframework.tooling.boot.java.ls.feature/feature.xml

@@ -8,6 +8,7 @@
 	<requires>
 		<import plugin="org.eclipse.ui.genericeditor"/>
 		<import plugin="org.eclipse.lsp4e"/>
+		<import plugin="org.springframework.tooling.ls.eclipse.gotosymbol"/>
 	</requires>
 
 	<plugin
@@ -18,12 +19,4 @@
 		unpack="false">
 	</plugin>
 
-	<plugin
-		id="org.springframework.tooling.ls.eclipse.gotosymbol"
-		download-size="0"
-		install-size="0"
-		version="0.0.0"
-		unpack="false">
-	</plugin>
-
 </feature>