Update dependencies for Eclipse 2019-06 RC1

Change-Id: Ieb975d6dd980446545babeea1f6a3e6064b93e89
diff --git a/parent/pom.xml b/parent/pom.xml
index af7bc8d..129b58b 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -23,13 +23,13 @@
 		<tycho-extras-version>${tycho-version}</tycho-extras-version>

 		<jboss-tycho-plugins-version>1.1.0</jboss-tycho-plugins-version>

 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

-		<platform-site>http://download.eclipse.org/eclipse/updates/4.12-I-builds/I20190501-1800/</platform-site>

-		<orbit-site>http://download.eclipse.org/tools/orbit/downloads/drops/S20190501151401/repository/</orbit-site>

+		<platform-site>http://download.eclipse.org/eclipse/updates/4.12milestones/S-4.12RC1a-201905310245/</platform-site>

+		<orbit-site>http://download.eclipse.org/tools/orbit/downloads/drops/R20190602212107/repository/</orbit-site>

 		<gef-site>http://download.eclipse.org/tools/gef/updates/legacy/releases/4.0.0_gef-master_1952/</gef-site>

-		<emf-site>http://download.eclipse.org/modeling/emf/emf/builds/milestone/S201904050820/</emf-site>

+		<emf-site>http://download.eclipse.org/modeling/emf/emf/builds/milestone/S201905280646/</emf-site>

 		<emf-transactions-site>http://download.eclipse.org/modeling/emf/transaction/updates/releases/R201805140824/</emf-transactions-site>

 		<emf-validation-site>http://download.eclipse.org/modeling/emf/validation/updates/releases/R201812070911/</emf-validation-site>

-		<swtbot-site>http://download.eclipse.org/technology/swtbot/releases/2.7.0/</swtbot-site>

+		<swtbot-site>http://download.eclipse.org/technology/swtbot/milestones/2019-06-m3/</swtbot-site>

 		<license-site>http://download.eclipse.org/cbi/updates/license/</license-site>

 	</properties>