457998: update Mylyn version to 3.14.1

Change-Id: I9df7b60215b6e44d626239f7db9677b4e517ffc9
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=457998
(cherry picked from commit 68bf3a04382d2a9ce6673b03e09b0a2ffbd90a95)
8 files changed