adiciona busca case insensitive em arquivos

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (46bb4a7) 65.44% compared to head (b7fefe3) 66.28%.

Files	Patch %	Lines
sintetizador/utils/fs.py	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15 +/- ## ========================================== + Coverage 65.44% 66.28% +0.84% ========================================== Files 21 21 Lines 955 964 +9 ========================================== + Hits 625 639 +14 + Misses 330 325 -5 ``` | [Flag](https://app.codecov.io/gh/rjmalves/sintetizador-dessem/pull/15/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Rogerio+Alves) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/rjmalves/sintetizador-dessem/pull/15/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Rogerio+Alves) | `66.28% <94.11%> (+0.84%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Rogerio+Alves#carryforward-flags-in-the-pull-request-comment) to find out more.

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