Update git submodules

* Update org.eclipse.mylyn from branch 'master'
  to 4b07e443e33fe2804c65a607efef96a548f3c867
  - 549699: [release] Release Mylyn 3.26
    
    Change-Id: I8c7b2497874cf028a4e5242be37118a75db4ad43
    Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=549699
    Signed-off-by: Frank Becker <eclipse@frank-becker.de>
diff --git a/org.eclipse.mylyn b/org.eclipse.mylyn
index 8656fa1..4b07e44 160000
--- a/org.eclipse.mylyn
+++ b/org.eclipse.mylyn
@@ -1 +1 @@
-Subproject commit 8656fa1733c390594331dc142b12cb8f6874ad93
+Subproject commit 4b07e443e33fe2804c65a607efef96a548f3c867