Prepare v1.12.1 release

[deirdresama]

Issue #, if available:

Description of changes: Removes the -SNAPSHOT suffix from the project version in preparation for the v1.12.1 release.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.94%. Comparing base (3c1b6b1) to head (75dd70c).
⚠️ Report is 156 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1163      +/-   ##
============================================
+ Coverage     67.23%   67.94%   +0.70%     
- Complexity     5484     5669     +185     
============================================
  Files           159      160       +1     
  Lines         23025    23370     +345     
  Branches       4126     4204      +78     
============================================
+ Hits          15481    15878     +397     
+ Misses         6262     6191      -71     
- Partials       1282     1301      +19     

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