⬆️ deps: Update Python dev dependencies

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
pytest (changelog)	>=9.1.0 → >=9.1.1
ruff (source, changelog)	>=0.15.17 → >=0.15.18
ty (changelog)	>=0.0.50 → >=0.0.52

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Release Notes

pytest-dev/pytest (pytest)

v9.1.1

Compare Source

pytest 9.1.1 (2026-06-19)

Bug fixes

• #​14220: Fixed a logic bug in pytest.RaisesGroup which would might cause it to display incorrect "It matches FooError() which was paired with BarError" messages.
• #​14591: Fixed a regression in pytest 9.1.0 which caused overriding a parametrized fixture with an indirect @​pytest.mark.parametrize to fail with "duplicate parametrization of '<fixture name>'".
• #​14606: Fixed list-item typing errors from mypy in @pytest.mark.parametrize <pytest.mark.parametrize ref> argvalues parameter.
• #​14608: Fixed a regression in pytest 9.1.0 where conftest.py files located in <invocation dir>/test* were no longer loaded as initial conftests when invoked without arguments.
  This could cause certain hooks (like pytest_addoption) in these files to not fire.

astral-sh/ty (ty)

v0.0.52

Compare Source

Released on 2026-06-22.

Bug fixes

• Avoid shadowing hints for attribute assignments (#​26164)
• Fix dict.pop overloads to accept arbitrary keys with defaults (#​26241)
• Normalize recursive TypeOf across multiple union arms (#​26230)
• Normalize recursive TypeOf growth during cycle recovery (#​26163)
• Normalize recursive protocol growth during cycle recovery (#​26246)
• Preserve generic alias identity during cycle recovery (#​26166)
• Recover from dynamic class code generator cycles (#​26167)

LSP server

• Add a go-to destination for Divergent (#​26162)
• Publish diagnostics for all open files after a single file is saved (#​25929)
• Render Markdown for reStructuredText fields in docstrings on hover (#​25903)

CLI

• Make error-on-warning the default (#​26157)

Diagnostics

• Make rendering of fix diffs more concise (#​26161)

Performance

• Avoid allocating disabled error context trees (#​26191)
• Avoid lookup maps for small place tables (#​26177)
• Avoid moving boxed use-def map builders (#​26211)
• Avoid transient AST ID merge map (#​26185)
• Batch signature typevar freshness scans (#​26196)
• Box large semantic index builders (#​26186)
• Build frozen definition maps directly (#​26188)
• Compact use-def binding interner keys (#​26193)
• Consume condition flow snapshots (#​26189)
• Lazily allocate reachability caches (#​26194)
• Remove redundant use-def state shrinking (#​26206)
• Reuse the first union bindings buffer (#​26225)
• Short-circuit terminal narrowing constraints (#​26215)
• Solve simple constraint conjunctions directly (#​25879)
• Store cycle-detector cache entries inline (#​26183)
• Stream indexed AST construction (#​26184)
• Suppress discarded TypedDict diagnostics (#​26250)
• Use SmallVec for CycleDetector::seen (#​26181)
• Use a SmallVec for seen type aliases (#​26187)

Core type checking

• Raise limit for number of non-recursive union literals (#​25212)
• Preserve gradual behavior for explicit Any subclasses (#​26034)
• Preserve metaclasses when inheriting from intersection-typed bases (#​26145)
• Recognize exhaustive matches over finite tuples (#​26132)

Contributors

• @​JamBalaya56562
• @​AlexWaygood
• @​carljm
• @​Minibrams
• @​lerebear
• @​MichaReiser
• @​charliermarsh

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: pyproject.toml

Artifact update for ruff resolved to version 0.15.19, which is a pending version that has not yet passed the Minimum Release Age threshold.
Renovate was attempting to update to 0.15.18
This is (likely) not a bug in Renovate, but due to the way your project pins dependencies, _and_ how Renovate calls your package manager to update them.
Until Renovate supports specifying an exact update to your package manager (https://github.com/renovatebot/renovate/issues/41624), it is recommended to directly pin your dependencies (with `rangeStrategy=pin` for apps, or `rangeStrategy=widen` for libraries)
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