deps: update typing-extensions requirement from >=4.8.0 to >=4.15.0

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Updates the requirements on typing-extensions to permit the latest version.

Release notes

Sourced from typing-extensions's releases.

4.15.0

No user-facing changes since 4.15.0rc1.

New features since 4.14.1:

• Add the @typing_extensions.disjoint_base decorator, as specified in PEP 800. Patch by Jelle Zijlstra.
• Add typing_extensions.type_repr, a backport of annotationlib.type_repr, introduced in Python 3.14 (CPython PR #124551, originally by Jelle Zijlstra). Patch by Semyon Moroz.
• Fix behavior of type params in typing_extensions.evaluate_forward_ref. Backport of CPython PR #137227 by Jelle Zijlstra.

Changelog

Sourced from typing-extensions's changelog.

Release 4.15.0 (August 25, 2025)

No user-facing changes since 4.15.0rc1.

Release 4.15.0rc1 (August 18, 2025)

• Add the @typing_extensions.disjoint_base decorator, as specified in PEP 800. Patch by Jelle Zijlstra.
• Add typing_extensions.type_repr, a backport of annotationlib.type_repr, introduced in Python 3.14 (CPython PR #124551, originally by Jelle Zijlstra). Patch by Semyon Moroz.
• Fix behavior of type params in typing_extensions.evaluate_forward_ref. Backport of CPython PR #137227 by Jelle Zijlstra.

Release 4.14.1 (July 4, 2025)

• Fix usage of typing_extensions.TypedDict nested inside other types (e.g., typing.Type[typing_extensions.TypedDict]). This is not allowed by the type system but worked on older versions, so we maintain support.

Release 4.14.0 (June 2, 2025)

Changes since 4.14.0rc1:

• Remove __or__ and __ror__ methods from typing_extensions.Sentinel on Python versions <3.10. PEP 604 was introduced in Python 3.10, and typing_extensions does not generally attempt to backport PEP-604 methods to prior versions.
• Further update typing_extensions.evaluate_forward_ref with changes in Python 3.14.

Release 4.14.0rc1 (May 24, 2025)

• Drop support for Python 3.8 (including PyPy-3.8). Patch by Victorien Plot.
• Do not attempt to re-export names that have been removed from typing, anticipating the removal of typing.no_type_check_decorator in Python 3.15. Patch by Jelle Zijlstra.
• Update typing_extensions.Format, typing_extensions.evaluate_forward_ref, and typing_extensions.TypedDict to align with changes in Python 3.14. Patches by Jelle Zijlstra.
• Fix tests for Python 3.14 and 3.15. Patches by Jelle Zijlstra.

New features:

• Add support for inline typed dictionaries (PEP 764). Patch by Victorien Plot.
• Add typing_extensions.Reader and typing_extensions.Writer. Patch by Sebastian Rittau.
• Add support for sentinels (PEP 661). Patch by Victorien Plot.

... (truncated)

Commits

• 9d1637e Prepare release 4.15.0 (#658)
• 4bd67c5 Coverage: exclude some noise (#656)
• e589a26 Coverage: add detailed report to job summary (#655)
• 67d37fe Coverage: Implement fail_under (#654)
• e9ae26f Don't delete previous coverage comment (#653)
• ac80bb7 Add Coverage workflow (#623)
• abaaafd Prepare release 4.15.0rc1 (#650)
• 9810405 Add @disjoint_base (PEP 800) (#634)
• 7ee9e05 Backport type_params fix from CPython (#646)
• 1e8eb9c Do not refer to PEP 705 as being experimental (#648)
• Additional commits viewable in compare view

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