chore(main): release 2.30.0

[release-please[bot]]

:robot: I have created a release beep boop

2.30.0 (2025-11-13)

Features

• Add bigframes.pandas.crosstab (#2231) (c62e553)
• Pivot_table supports fill_value arg (#2257) (8f490e6)
• Preserve source names better for more readable sql (#2243) (64995d6)
• Support builtins funcs for df.agg (#2256) (956a5b0)
• Support mixed scalar-analytic expressions (#2239) (20ab469)

Bug Fixes

• Do not warn with DefaultIndexWarning in partial ordering mode (#2230) (cc2dbae)

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