Update mypy requirement from ==1.4.* to ==1.5.*

[dependabot[bot]]

Updates the requirements on mypy to permit the latest version.

Commits

• a6bd80e Remove +dev from version
• 9dd0d39 Manually revert "Add support for attrs.fields (#15021)" (#15674)
• 45e1bf7 Typeshed cherry-pick: Fix @​patch when new is missing (#10459) (#15673)
• 7a94183 Fix dataclass/protocol crash on joining types (#15629)
• 2ebd51e Teach stubgen to work with complex and unary expressions (#15661)
• 3983381 Fix testLiteralMeets failure (#15659)
• 3bf8521 Consistently avoid type-checking unreachable code (#15386)
• dfea43f Add error code "explicit-override" for strict @​override mode (PEP 698) (#15512)
• 8a5d8f0 type_narrowing.rst: fix syntax, consistency (#15652)
• b78f4b5 Add runtime __slots__ attribute to attrs (#15651)
• Additional commits viewable in compare view

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[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (570dae0) 98.16% compared to head (dcf93fb) 98.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #110 +/- ## ======================================= Coverage 98.16% 98.16% ======================================= Files 5 5 Lines 272 272 ======================================= Hits 267 267 Misses 5 5 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `98.16% <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=Fabio+Caccamo#carryforward-flags-in-the-pull-request-comment) to find out more.

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