chore(deps): bump pytest-mock from 3.15.1 to 3.16.0 in /backend

[dependabot]

Bumps pytest-mock from 3.15.1 to 3.16.0.

Release notes

Sourced from pytest-mock's releases.

v3.16.0

2026-09-27

• #604: Fixed duplicate_iterators=True for async functions spied with mocker.spy.
• #611: Fixed async mock assertion introspection to use awaited arguments instead of the latest call's arguments.
• #606: mocker.resetall(return_value=True, side_effect=True) now also applies to non-callable mocks, such as those returned by mocker.create_autospec(SomeClass, instance=True). Previously both arguments were silently ignored for them.
• #547: Added SpyType for annotating mocker.spy results.
• Dropped support for EOL Python 3.9.
• #147: Removed handling of RuntimeError: stop called on unstarted patcher, which can no longer occur in the supported Python versions.
• Added support for Python 3.15.

Changelog

Sourced from pytest-mock's changelog.

3.16.0

2026-09-27

• [#604](https://github.com/pytest-dev/pytest-mock/issues/604) <https://github.com/pytest-dev/pytest-mock/pull/604>_: Fixed duplicate_iterators=True for async functions spied with mocker.spy.
• [#611](https://github.com/pytest-dev/pytest-mock/issues/611) <https://github.com/pytest-dev/pytest-mock/pull/611>_: Fixed async mock assertion introspection to use awaited arguments instead of the latest call's arguments.
• [#606](https://github.com/pytest-dev/pytest-mock/issues/606) <https://github.com/pytest-dev/pytest-mock/pull/606>_: mocker.resetall(return_value=True, side_effect=True) now also applies to non-callable mocks, such as those returned by mocker.create_autospec(SomeClass, instance=True). Previously both arguments were silently ignored for them.
• [#547](https://github.com/pytest-dev/pytest-mock/issues/547) <https://github.com/pytest-dev/pytest-mock/issues/547>_: Added SpyType for annotating mocker.spy results.
• Dropped support for EOL Python 3.9.
• [#147](https://github.com/pytest-dev/pytest-mock/issues/147) <https://github.com/pytest-dev/pytest-mock/issues/147>_: Removed handling of RuntimeError: stop called on unstarted patcher, which can no longer occur in the supported Python versions.
• Added support for Python 3.15.

Commits

• f3b531f Release 3.16.0
• 71ed673 Fix duplicate_iterators for async spies (#604)
• 0797e3d Fix async assertion argument introspection (#611)
• e24c334 docs: import os in the opening usage example (#612)
• 9e7eb7b [pre-commit.ci] pre-commit autoupdate (#613)
• 445fd4d [pre-commit.ci] pre-commit autoupdate (#610)
• a8bd0b1 Honour resetall() arguments for non-callable mocks (#606)
• 6559fdf [pre-commit.ci] pre-commit autoupdate (#608)
• 466d026 [pre-commit.ci] pre-commit autoupdate (#605)
• 164defe [pre-commit.ci] pre-commit autoupdate (#603)
• Additional commits viewable in compare view

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[purvanshjoshi]

Approved: Legitimate dependabot patch/minor update with bug fixes and security improvements.

[purvanshjoshi]

@dependabot rebase