Reflect that dill is no longer a default pickler.

[tvalentyn]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request updates the Python SDK documentation to accurately reflect the current default pickling library used by Apache Beam. It clarifies that cloudpickle is now the default for versions 2.65.0 and later, and explains the implications for using the --save_main_session option, which is no longer required with cloudpickle. The changes ensure that users have up-to-date information regarding pickler usage and main session management.

Highlights

• Default Pickler Update: The documentation has been updated to reflect that cloudpickle is now the default pickler for Apache Beam versions 2.65.0 and later, replacing dill.
• Main Session Management: Clarification has been added that the --save_main_session pipeline option is no longer necessary when using cloudpickle as the pickler.
• Historical Context: The documentation now specifies that dill was the default pickler only for Apache Beam 2.64.0 and earlier versions.

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[tvalentyn]

R: @claudevdm

[github-actions]

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