x509roots/fallback: update bundle

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

[git-generate]
go generate ./x509roots

Change-Id: Icb71f9f7c509dc6f49ad4385aa287bd6a8966523
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/681915
Auto-Submit: Gopher Robot <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Roland Shoemaker <[email protected]>

Author: gopherbot