net/http: use math/rand/v2 instead of math/rand
math/rand/v2 provides a more modern, performant, and secure random number API.
Change-Id: Ic0c30ae40623508e3ed65c435be3c208704b5655
GitHub-Last-Rev:
a8fa520b39cb5cc56042b74f6c40163bf8115247
GitHub-Pull-Request: golang/go#76433
Reviewed-on: https://go-review.googlesource.com/c/go/+/723680
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Damien Neil <dneil@google.com>