Update golangci and codecov

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 46.95%. Comparing base (3fe840b) to head (00968cf).

:exclamation: Current head 00968cf differs from pull request most recent head 7885ae4. Consider uploading reports for the commit 7885ae4 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #30 +/- ## ========================================== - Coverage 52.14% 46.95% -5.20% ========================================== Files 10 13 +3 Lines 629 854 +225 ========================================== + Hits 328 401 +73 - Misses 227 367 +140 - Partials 74 86 +12 ``` | [Flag](https://app.codecov.io/gh/digitorus/pdfsign/pull/30/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=digitorus) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/digitorus/pdfsign/pull/30/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=digitorus) | `46.95% <ø> (-5.20%)` | :arrow_down: | 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=digitorus#carryforward-flags-in-the-pull-request-comment) to find out more.

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