Update Tycho pomless to 2.6.0

Change-Id: I71688c233b4da8f56b477e4989ba137a1a57c888
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.resources/+/189873
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Alexander Kurtakov <akurtako@redhat.com>

.mvn/extensions.xml

diff --git a/.mvn/extensions.xml b/.mvn/extensions.xml
index 8258f8b..e271fa6 100644
--- a/.mvn/extensions.xml
+++ b/.mvn/extensions.xml
@@ -16,6 +16,6 @@
   <extension>

     <groupId>org.eclipse.tycho.extras</groupId>

     <artifactId>tycho-pomless</artifactId>

-    <version>2.5.0</version>

+    <version>2.6.0</version>

   </extension>

 </extensions>
\ No newline at end of file