changing repository to http://download.eclipse.org/releases/2019-09/
to try to find BIRT in tycho

org.eclipse.stem/releng/org.eclipse.stem.tycho.configuration/pom.xml

diff --git a/org.eclipse.stem/releng/org.eclipse.stem.tycho.configuration/pom.xml b/org.eclipse.stem/releng/org.eclipse.stem.tycho.configuration/pom.xml
index 8a901e0..8bfd22f 100755
--- a/org.eclipse.stem/releng/org.eclipse.stem.tycho.configuration/pom.xml
+++ b/org.eclipse.stem/releng/org.eclipse.stem.tycho.configuration/pom.xml
@@ -20,7 +20,7 @@
 		</repository>

 		<repository>

 			<id>Xtext</id>

-			<url>https://download.eclipse.org/releases/2021-03/</url>

+			<url>http://download.eclipse.org/releases/2019-09/</url>

 			<layout>p2</layout>

 		</repository>

 		<repository>