Support yml suffix (without A) in dbt-checkpoint config file

[BAntonellini]

No description provided.

[ronak-datatonic]

Can you provide test evidence of a mock yaml file with and without the "a"?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 97.93%. Comparing base (739d419) to head (b7ea885).

Files	Patch %	Lines
dbt_checkpoint/utils.py	50.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
=======================================
  Coverage   97.92%   97.93%           
=======================================
  Files          50       50           
  Lines        2462     2466    +4     
  Branches      327      329    +2     
=======================================
+ Hits         2411     2415    +4     
+ Misses         32       31    -1     
- Partials       19       20    +1     

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[ronak-datatonic]

Thanks for adding a test, lgtm!