Modules: remove athens.azurefd.net It appears to have been decommissioned (no valid TLS cert). Change-Id: I7f9af976ce60129061473ac2244c8c1ec98e5caa Reviewed-on: https://go-review.googlesource.com/c/wiki/+/647636 Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Commit-Queue: Ian Lance Taylor <iant@golang.org>