Update git submodules

* Update org.eclipse.mylyn from branch 'master'
  to ae4673c5c2464118054e885f7a149368221f2141
  - 562490: OOMPH: support 2020-06
    
    Change-Id: Iaaf4393390bc236b48e8cbf73da1b29ffc26a24c
    Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=562490
    Signed-off-by: Frank Becker <eclipse@frank-becker.de>
diff --git a/org.eclipse.mylyn b/org.eclipse.mylyn
index 8a8b341..ae4673c 160000
--- a/org.eclipse.mylyn
+++ b/org.eclipse.mylyn
@@ -1 +1 @@
-Subproject commit 8a8b341ac9f7b8255a3b898407a4776c153f12e1
+Subproject commit ae4673c5c2464118054e885f7a149368221f2141