feat(tests): update pytest to 9.0.2

[roflcoopter]

Update pytest and related deps to latest version

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[Copilot]

Pull request overview

Updates the project’s testing toolchain to newer pytest and plugin versions, and adjusts the test DB janitor setup to match the updated pytest-postgresql interface.

Changes:

• Bump pytest and several pytest-related plugins in requirements_test.txt.
• Update DatabaseJanitor(...) usage in test fixtures to use keyword arguments (compatible with newer pytest-postgresql).
• Update coverage and pin previously unpinned test tooling dependencies.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/conftest.py	Switch DatabaseJanitor construction to keyword args for compatibility with updated pytest-postgresql.
requirements_test.txt	Update/pin pytest and related testing dependencies (pytest-cov, pytest-postgresql, etc.).

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