fix: to work with 3.12 and add examples tests

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (12cbf9b) 36.77% compared to head (dc7a016) 39.71%.

Files	Patch %	Lines
codebleu/parser/build.py	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================== + Coverage 36.77% 39.71% +2.94% ========================================== Files 12 12 Lines 1648 1541 -107 ========================================== + Hits 606 612 +6 + Misses 1042 929 -113 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.