build(deps): update mutmut requirement from >=3.0.0 to >=3.5.0 in /backend

[dependabot]

Updates the requirements on mutmut to permit the latest version.

Changelog

Sourced from mutmut's changelog.

3.5.0

* Filter mutants based on type annotations. This feature needs to be turned on with the `type_check_command` config.


Support running on Windows


Save mutation stats for use with CI/CD pipeline (#460)


Async functions fixed


Fix for functions with positional only arguments


Support signatures with PEP 649 deferred annotations


3.4.0

• Add action to view tests for mutant

• Add basic description for all results in mutmut browse

• Add description for timeout mutants

• Early exit when stats find no tests for any mutant

• Support python 3.14

• Performance improvements

• Fix mutate_only_covered_lines when files are excluded from test run

• Add pytest_add_cli_args and pytest_add_cli_args_test_selection configs

• mutate_only_covered_lines added to config to control whether coverage.py is used to filter down mutations

• Filter out identical string mutants with different values

• Handle more exit codes

• Disable common order-randomising pytest plugins, as that can seriously deteriorate mutation testing performance

• Fixed packaging issue

3.3.1

* Increased threshold for mutant timeouts
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