chore(deps): update pyflakes requirement from <4.0,>=3.1 to >=3.1,<5.0 in the python-dependencies group

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Updates the requirements on pyflakes to permit the latest version.
Updates pyflakes to 4.0.0

Changelog

Sourced from pyflakes's changelog.

4.0.0 (2026-09-22)

• Add support for python 3.15
• Drop support for EOL python 3.9
• Add new errors for lazy imports:
  • lazy import is eagerly used at module scope
  • lazy from ... import * is invalid syntax
  • lazy from __future__ import ... is invalid syntax
  • lazy import must be at module scope
• Improve typing specialization:
  • Handle cast(...) with named arguments
  • Fix duplicate errors in first argument of cast(...)
  • Handle TypeVar(... default='...')
  • Fix missing error for first argument of TypeVar(...) call
  • Update handling of NamedTuple(...) for python 3.15 changes
  • Update handling of TypedDict(...) for python 3.13 changes
  • Add handling of assert_type(...)
  • Add handling of NewType(...)
  • Add handling of TypeVarTuple(...)
  • Add handling of ParamSpec(...)
• Fix assignment expressions in dictionary literals
• Remove file_tokens parameter to Checker. Unused since 3.0.0
• Fix false-negative for deleting special variables such as del __tracebackhide__
• Add support for python3t shebangs
• Remove support for obsolete python3m and pythonu shebangs

3.4.0 (2025-06-20)

• Add support for python 3.14
• Add "t-string is missing placeholders" error
• Fix annotation erroneously causing a name to be defined with from __future__ import annotations
• Add support for always-deferred annotations (PEP 749)

3.3.2 (2025-03-31)

• Fix crash with global / nonlocal in class bodies (regressed in 3.3.0)

3.3.1 (2025-03-30)

• Allow assignment expressions to redefine annotations (regressed in 3.3.0)

3.3.0 (2025-03-29)

• Add __debuggerskip__ as a special local
• Allow assignment expressions to redefine outer names
• Drop support for EOL python 3.8
• Add new error for unused global / nonlocal names

3.2.0 (2024-01-04)

... (truncated)

Commits

• bda5e1d Release 4.0.0
• f6e565c remove redundant tests coverage check (#901)
• dbf9fcc enforce 100% test coverage (#900)
• c9619fc add test to ensure iterSourceCode does not process dead links (#899)
• a6e8a11 detect python3t and remove detection for python3m and pythonu (#897)
• fa7a02c add test for check(...) of non-string (#898)
• 2a8910c add test for submodule import redefining a name (#896)
• 5ef97ef improve coverage for all handling (#895)
• 66f1758 add test for call of attribute of undefined name (#894)
• dae13ed rework and test custom builtins (#893)
• Additional commits viewable in compare view

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