build(deps): bump mypy from 1.19.1 to 1.20.0 in /requirements (#21650)

* build(deps): bump mypy from 1.19.1 to 1.20.0 in /requirements

Bumps [mypy](https://github.com/python/mypy) from 1.19.1 to 1.20.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](https://github.com/python/mypy/compare/v1.19.1...v1.20.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* fix: remove type ignore comments for precision handling in connector and accelerator_connector

* fix: drop dead Python <3.10 guard in registry entry_points call

The minimum supported Python version is 3.10, so the `_PYTHON_GREATER_EQUAL_3_10_0`
ternary in `_load_external_callbacks` was unreachable and caused a mypy error with
the 1.20.0 upgrade (`dict[Never, Never]` incompatible with `EntryPoints`).

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: bhimrazy <bhimrajyadav977@gmail.com>