workspace: update CoreDNS to 1.9.2

This removes a patch that has gone upstream in the meantime.

Change-Id: Ie7192e974f2444091c257ca12d97aa634d962ce7
Reviewed-on: https://review.monogon.dev/c/monogon/+/683
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
diff --git a/go.mod b/go.mod
index a2c4469..319d1c5 100644
--- a/go.mod
+++ b/go.mod
@@ -67,7 +67,7 @@
 	github.com/container-storage-interface/spec v1.5.0
 	github.com/containerd/containerd v1.6.1
 	github.com/containernetworking/plugins v1.0.1
-	github.com/coredns/coredns v1.9.1
+	github.com/coredns/coredns v1.9.2
 	github.com/corverroos/commentwrap v0.0.0-20191204065359-2926638be44c
 	github.com/diskfs/go-diskfs v1.2.0
 	github.com/go-delve/delve v1.8.2