PyPy: close gzip and bz2 wrapper streams explicitly

[codecov[bot]]

Codecov Report

Patch coverage: 58.62% and project coverage change: +1.19 :tada:

Comparison is base (1131836) 52.40% compared to head (493f0cd) 53.60%.

:exclamation: Current head 493f0cd differs from pull request most recent head 99299b5. Consider uploading reports for the commit 99299b5 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #27 +/- ## ========================================== + Coverage 52.40% 53.60% +1.19% ========================================== Files 1 1 Lines 229 250 +21 ========================================== + Hits 120 134 +14 - Misses 109 116 +7 ``` | [Impacted Files](https://app.codecov.io/gh/alugowski/fast_matrix_market/pull/27?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Lugowski) | Coverage Δ | | |---|---|---| | [python/src/fast\_matrix\_market/\_\_init\_\_.py](https://app.codecov.io/gh/alugowski/fast_matrix_market/pull/27?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Adam+Lugowski#diff-cHl0aG9uL3NyYy9mYXN0X21hdHJpeF9tYXJrZXQvX19pbml0X18ucHk=) | `53.60% <58.62%> (+1.19%)` | :arrow_up: |

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