[releng] Use latest tycho for releng build too

releng/org.eclipse.emf.releng/pom.xml

diff --git a/releng/org.eclipse.emf.releng/pom.xml b/releng/org.eclipse.emf.releng/pom.xml
index 5d111a0..2bfb37a 100644
--- a/releng/org.eclipse.emf.releng/pom.xml
+++ b/releng/org.eclipse.emf.releng/pom.xml
@@ -6,7 +6,7 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <tycho.scmUrl>scm:git:https://git.eclipse.org/r/p/emf/org.eclipse.emf.git</tycho.scmUrl>
-    <tycho-version>2.2.0</tycho-version>
+    <tycho-version>2.7.3</tycho-version>
     <os-jvm-flags />
   </properties>