[Feature Request]: Add support for Python 3.15

[jrmccluskey]

What would you like to happen?

Add support for Python 3.15 to the Beam Python SDK. The first full release of 3.15 is expected to be out on October 1, 2026. There is some delay expected between release and support for the version in Beam, as dependency libraries must also add support for 3.15.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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