Enable Ruff UP035 checks

[coderabbitai]

Summary

Enable Ruff rule UP035 for the project.

Rationale

Rule UP035 reports imports from typing that should use collections.abc. For example, Iterator should be imported as from collections.abc import Iterator on the supported Python versions.

Affected areas

• Ruff configuration in the repository configuration files
• Existing Python source files that violate UP035
• CI and local lint validation

Acceptance criteria

• Ruff enables UP035.
• The codebase has no UP035 violations.
• The lint command passes with the updated configuration.

Backlinks

• Pull request: Ability to configure maintenance database name other than postgres - closes #653 #1394
• Review comment: Ability to configure maintenance database name other than postgres - closes #653 #1394 (comment)
• Requested by: @fizyk

[coderabbitai]

🔗 Related PRs

#1289 - Codecov fixes [merged]
#1370 - Add pyproject-fmt to pre-commit [merged]
#1379 - Add Python 3.15 to the CI [merged]
#1391 - Introduce FBT linter - closes #1387 [merged]

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