Update git submodules

* Update org.eclipse.mylyn from branch 'master'
  to a7cd1992732dcadf4acd76ceed0220262491cb98
  - update snapshot sites to 3.24
  - 536060: update org.eclipse.mylyn versions to 3.24.1
    
    Change-Id: I0000000000000000000000000000000000000000
    Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=536060
    
1 file changed