x509roots/fallback: update bundle

This is an automated CL which updates the NSS root bundle.

[git-generate]
go generate ./x509roots

Change-Id: I9ab454c977013b2f6a42bc93fb0649612c54c6c0
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/709475
Reviewed-by: Roland Shoemaker <roland@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

Author: gopherbot