Merge remote-tracking branch 'refs/remotes/origin/release/2.4' into release/2.4

Author: Jintao-Huang

swift/version.py

@@ -1,5 +1,5 @@
 # Make sure to modify __release_datetime__ to release time when making official release.
-__version__ = '2.4.1'
+__version__ = '2.4.2'
 # default release datetime for branches under active development is set
 # to be a time far-far-away-into-the-future
 __release_datetime__ = '2099-10-13 08:56:12'