chore(main): release bigframes 2.43.1

[release-please]

🤖 I have created a release beep boop

2.43.1 (2026-06-23)

Bug Fixes

• avoid invalid CAST(NULL AS NULL) in SQLGlot compiler (#17487) (3b79caa)
• bigframes: world-readable temp zip in create_cloud_function (#17522) (e726878)
• bump @angular/common, @angular/forms, @angular/platform-browser and @angular/router in /packages/bigframes/bigframes/display/table_widget_angular (#17525) (2f893b1)
• bump langsmith from 0.8.0 to 0.8.18 in /packages/bigframes (#17518) (f23063f)
• bump msgpack from 1.1.1 to 1.2.1 in /packages/bigframes (#17520) (36b5b7e)
• bump undici and @angular/build in /packages/bigframes/bigframes/display/table_widget_angular (#17519) (6fc45e3)
• handle empty endpoints during cloud function reuse (#17501) (4f5593a)

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