Update minimum version of python.

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f916cb1) 99.92% compared to head (6d0a291) 99.92%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ======================================= Coverage 99.92% 99.92% ======================================= Files 15 15 Lines 1290 1290 ======================================= Hits 1289 1289 Misses 1 1 ``` | [Flag](https://app.codecov.io/gh/simonrp84/PyCoxMunk/pull/10/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Simon+Proud) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/simonrp84/PyCoxMunk/pull/10/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Simon+Proud) | `99.92% <ø> (ø)` | | 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=Simon+Proud#carryforward-flags-in-the-pull-request-comment) to find out more.

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