chore: test against python 3.13 release

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (5252cc6) to head (bb44293). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #351 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 1 1 Lines 77 77 ========================================= Hits 77 77 ``` | [Flag](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | Coverage Δ | | |---|---|---| | [3.10](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (ø)` | | | [3.11](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (ø)` | | | [3.12](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (ø)` | | | [3.13](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (?)` | | | [3.13.0-rc.1](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `?` | | | [3.8](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (ø)` | | | [3.9](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `100.00% <ø> (ø)` | | | [pypy3.10](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `98.70% <ø> (ø)` | | | [pypy3.9](https://app.codecov.io/gh/corenting/immutabledict/pull/351/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Corentin+Garcia) | `98.70% <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=Corentin+Garcia#carryforward-flags-in-the-pull-request-comment) to find out more.

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