Lint Code Base

Update _base.py #1479

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6 errors and 1 notice

Process completed with exit code 1.

The process '/opt/hostedtoolcache/ruff/0.12.9/x86_64/ruff' failed with exit code 1

Would reformat

The process '/opt/hostedtoolcache/ruff/0.12.9/x86_64/ruff' failed with exit code 1

src/a2a/_base.py:44:16: E713 Test for membership should be `not in`

src/a2a/_base.py:1:1: I001 Import block is un-sorted or un-formatted

repository contains 21 duplications. 0 duplications were part of this PR and were annotated