chore(deps): update dependency a2a-sdk to v0.3.26

[red-hat-konflux-kflux-prd-rh02]

This PR contains the following updates:

Package	Change	Age	Confidence
a2a-sdk (changelog)	==0.3.24 → ==0.3.26

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Release Notes

a2aproject/a2a-python (a2a-sdk)

v0.3.26

Compare Source

Features

• Add support for more Task Message and Artifact fields in the Vertex Task Store (#​908) (5e0dcd7)

Bug Fixes

• remove the use of deprecated types from VertexTaskStore (#​889) (6d49122)

v0.3.25

Compare Source

Features

• Implement a vertex based task store (#​752) (fa14dbf)

Bug Fixes

• return background task from consume_and_break_on_interrupt to prevent GC (#​775) (a236d4d)
• use default_factory for mutable field defaults in ServerCallContext (#​744) (22b25d6)

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Documentation

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