x509roots/fallback: update bundle

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

Change-Id: I95cf0b3e86f1e013d486a0bbd050a8b4bea5d6e9
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/610060
Reviewed-by: Roland Shoemaker <[email protected]>
Auto-Submit: Gopher Robot <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>

Author: gopherbot