Release notes generator script: add retries with exponential backoff (#29077)
Release notes generator script: add retries with exponential backoff (#29077)

* Release notes script: add retries with exponential backoff

* Automated change: Fix sanity tests

Co-authored-by: drfloob <b1c09c04a853d721a9790a600fd8fdbb332130cf@users.noreply.github.com>
jtattermusch/grpc,jtattermusch/grpc,ctiller/grpc,stanley-cheung/grpc,ctiller/grpc,ctiller/grpc,ctiller/grpc,jtattermusch/grpc,grpc/grpc,stanley-cheung/grpc,grpc/grpc,grpc/grpc,grpc/grpc,stanley-cheung/grpc,vjpai/grpc,ejona86/grpc,ctiller/grpc,vjpai/grpc,ctiller/grpc,ejona86/grpc,ejona86/grpc,grpc/grpc,ejona86/grpc,vjpai/grpc,vjpai/grpc,stanley-cheung/grpc,stanley-cheung/grpc,vjpai/grpc,stanley-cheung/grpc,ctiller/grpc,ctiller/grpc,jtattermusch/grpc,stanley-cheung/grpc,nicolasnoble/grpc,ejona86/grpc,jtattermusch/grpc,vjpai/grpc,jtattermusch/grpc,ejona86/grpc,stanley-cheung/grpc,nicolasnoble/grpc,ctiller/grpc,grpc/grpc,jtattermusch/grpc,vjpai/grpc,grpc/grpc,vjpai/grpc,ejona86/grpc,grpc/grpc,vjpai/grpc,jtattermusch/grpc,jtattermusch/grpc,nicolasnoble/grpc,nicolasnoble/grpc,stanley-cheung/grpc,ctiller/grpc,nicolasnoble/grpc,ejona86/grpc,jtattermusch/grpc,ejona86/grpc,stanley-cheung/grpc,nicolasnoble/grpc,jtattermusch/grpc,nicolasnoble/grpc,stanley-cheung/grpc,nicolasnoble/grpc,vjpai/grpc,nicolasnoble/grpc,ctiller/grpc,jtattermusch/grpc,nicolasnoble/grpc,nicolasnoble/grpc,vjpai/grpc,grpc/grpc,grpc/grpc,stanley-cheung/grpc,vjpai/grpc,nicolasnoble/grpc,grpc/grpc,grpc/grpc,ejona86/grpc,ejona86/grpc,ejona86/grpc,ctiller/grpc