pantsbuild / pants / 21878013120

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update the default & internal versions of mypy to 1.19.x (#23058)

Changelog: https://mypy-lang.blogspot.com/2025/11/mypy-119-released.html

Default:
```
Lockfile diff: mypy.lock [mypy]

==                    Upgraded dependencies                     ==

  mypy                           1.18.2       -->   1.19.1
  pathspec                       0.12.1       -->   1.0.4
  tomli                          2.3.0        -->   2.4.0

==                      Added dependencies                      ==

  librt                          0.7.8
```

Internal:
```
Lockfile diff: 3rdparty/python/mypy.lock [mypy]

==                    Upgraded dependencies                     ==

  mypy                           1.18.2       -->   1.19.1
  pathspec                       0.12.1       -->   1.0.4

==                      Added dependencies                      ==

  librt                          0.7.8
```

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