[Bug]: Tests are failing on 1.0-dev

[ishymko]

What happened?

Tests are failing on 1.0-dev

Relevant log output

See https://github.com/a2aproject/a2a-python/actions/runs/21520017047/job/62008309612?pr=651

Code of Conduct

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[ishymko]

Apparently MySQL test aren't working on #511, repro: #651.