[release-branch.go1.20] net/http: regenerate h2_bundle.go

Pull in a security fix from x/net/http2:
http2: limit maximum handler goroutines to MaxConcurrentStreamso

For #63417
Fixes #63426
Fixes CVE-2023-39325

Change-Id: I6e32397323cd9b4114c990fcc9d19557a7f5f619
Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/2047401
Reviewed-by: Tatiana Bradley <[email protected]>
TryBot-Result: Security TryBots <[email protected]>
Run-TryBot: Damien Neil <[email protected]>
Reviewed-by: Ian Cottrell <[email protected]>
Reviewed-on: https://go-review.googlesource.com/c/go/+/534255
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Damien Neil <[email protected]>
TryBot-Bypass: Dmitri Shuralyov <[email protected]>
Reviewed-by: Michael Pratt <[email protected]>
Auto-Submit: Dmitri Shuralyov <[email protected]>