Update pytest-asyncio requirement from >=0.24.0 to >=0.26.0 in /backend

[dependabot]

Updates the requirements on pytest-asyncio to permit the latest version.

Release notes

Sourced from pytest-asyncio's releases.

pytest-asyncio 0.26.0

• Adds configuration option that sets default event loop scope for all tests #793
• Improved type annotations for pytest_asyncio.fixture #1045
• Added typing-extensions as additional dependency for Python <3.10 #1045

Commits

• 4f8ce45 docs: Prepare release of v0.26.0.
• 498e8a7 Build(deps): Bump attrs from 25.1.0 to 25.3.0 in /dependencies/default
• 01c22ff build: Update project metadata to use SPDX license identifier
• 78191c9 [pre-commit.ci] pre-commit autoupdate
• 9a45551 Build(deps): Bump hypothesis in /dependencies/default
• 6680409 Build(deps): Bump coverage from 7.7.0 to 7.7.1 in /dependencies/default
• aa82c57 Build(deps): Bump iniconfig from 2.0.0 to 2.1.0 in /dependencies/default
• cca587e [pre-commit.ci] pre-commit autoupdate
• 5d90b29 Build(deps): Bump hypothesis in /dependencies/default
• c262262 Build(deps): Bump coverage from 7.6.12 to 7.7.0 in /dependencies/default
• Additional commits viewable in compare view

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