google-gax: v6.9.0

6.9.0 (2026-09-28)

Features

• gax: Allow customers to enable tracing with environmental variables (#9438) (11d6a6f)
• gax: Differentiate between server side and client side errors (#9451) (c477918)
• gax: Propagate span context to child spans in TracerHelper (#9455) (a6c20e9)
• gax: Support resumable uploads (#9287) (8116709)
• o11y: Remove experimental flag requirement for tracing (#9423) (feb2851)