[MLGO] Bump MLGO utils version to 20

Summary:
This patch bumps the MLGO utilities python package version to v20 in
sync with the rest of the project. This should be automated later in the
version update script, but this needs to be updated even while a patch
for that lands.

Test Plan: 

Reviewers: 

Subscribers: 

Tasks: 

Tags: 


Differential Revision: https://phabricator.intern.facebook.com/D60251670

Author: boomanaiden154

llvm/utils/mlgo-utils/mlgo/__init__.py

@@ -4,7 +4,7 @@
 
 from datetime import timezone, datetime
 
-__versioninfo__ = (19, 0, 0)
+__versioninfo__ = (20, 0, 0)
 __version__ = (
     ".".join(str(v) for v in __versioninfo__)
     + "dev"