Create CNAME for fedi.crates.io

The crates.io team plans to use Mastodon for status updates in the
feature and has rented its own Mastodon server for this. A new CNAME has
been created under the `crates.io` domain that points to this host.

See rust-lang/crates.io#6877 for more details.

Author: jdno

Diff for: terraform/dns/.terraform.lock.hcl

@@ -11,6 +11,7 @@ module "crates_io" {
   ttl     = 300
 
   CNAME = {
+    "fedi"   = ["vip.masto.host"]
     "status" = ["pvbm341xnpgm.stspg-customer.com"],
     "doc"    = ["rust-lang.github.io"], # https://github.com/rust-lang/cargo/tree/gh-pages
   }