chore: Update all (major)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Age	Confidence
actions/checkout	action	major	v3 → v6
markupsafe (changelog)		major	==2.1.1 → ==3.0.3

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Release Notes

actions/checkout (actions/checkout)

v6

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v5

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v4

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• url-helper.ts now leverages well-known environment variables by @​jww3 in #​1941
• Expand unit test coverage for isGhes by @​jww3 in #​1946

pallets/markupsafe (markupsafe)

v3.0.3

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Released 2025-09-27

• __version__ raises DeprecationWarning instead of UserWarning.
  :issue:487
• Adopt multi-phase initialisation (:pep:489) for the C extension.
  :issue:494
• Build Windows ARM64 wheels. :issue:485
• Build Python 3.14 wheels. :issue:503
• Build riscv64 wheels. :issue:505

v3.0.2

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Released 2024-10-18

• Fix compatibility when __str__ returns a str subclass. :issue:472
• Build requires setuptools >= 70.1. :issue:475

v3.0.1

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Released 2024-10-08

• Address compiler warnings that became errors in GCC 14. :issue:466
• Fix compatibility with proxy objects. :issue:467

v3.0.0

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Released 2024-10-07

• Support Python 3.13 and its experimental free-threaded build. :pr:461
• Drop support for Python 3.7 and 3.8.
• Use modern packaging metadata with pyproject.toml instead of setup.cfg.
  :pr:348
• Change distutils imports to setuptools. :pr:399
• Use deferred evaluation of annotations. :pr:400
• Update signatures for Markup methods to match str signatures. Use
  positional-only arguments. :pr:400
• Some str methods on Markup no longer escape their argument:
  strip, lstrip, rstrip, removeprefix, removesuffix,
  partition, and rpartition; replace only escapes its new
  argument. These methods are conceptually linked to search methods such as
  in, find, and index, which already do not escape their argument.
  :issue:401
• The __version__ attribute is deprecated. Use feature detection, or
  importlib.metadata.version("markupsafe"), instead. :pr:402
• Speed up escaping plain strings by 40%. :pr:434
• Simplify speedups implementation. :pr:437

v2.1.5

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Released 2024-02-02

• Fix striptags not collapsing spaces. :issue:417

v2.1.4

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Released 2024-01-19

• Don't use regular expressions for striptags, avoiding a performance
  issue. :pr:413

v2.1.3

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Released 2023-06-02

• Implement format_map, casefold, removeprefix, and removesuffix
  methods. :issue:370
• Fix static typing for basic str methods on Markup. :issue:358
• Use Self for annotating return types. :pr:379

v2.1.2

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Released 2023-01-17

• Fix striptags not stripping tags containing newlines.
  :issue:310

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