deps: sync dev tool versions

[stranske]

Dev Tool Version Sync

This PR updates dev tool versions in pyproject.toml to match the central
version pins from stranske/Workflows.

Changes

Found 2 version updates:
  - ruff: ==0.15.17 -> ==0.15.18
  - pytest: ==9.1.0 -> ==9.1.1

Run with --apply to update dependency files

Why

Consistent dev tool versions across repos ensures:

• CI behaviors match between repos
• No surprises from version drift
• Easier debugging when tools behave the same everywhere

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Source: .github/workflows/autofix-versions.env

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 7222eb67-3729-4378-8dc8-59e8b68d38c3

📥 Commits

Reviewing files that changed from the base of the PR and between d64783e and 4bcb9d1.

📒 Files selected for processing (2)

• .github/workflows/autofix-versions.env
• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch deps/sync-dev-versions-d29220392376

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[stranske]

Closing as superseded by newer dev-tool-sync PR #873 from wave deps/sync-dev-versions-9242f347523d.