🌱 Bump github.com/coredns/corefile-migration

Bumps [github.com/coredns/corefile-migration](https://github.com/coredns/corefile-migration) from 1.0.19 to 1.0.20.
- [Release notes](https://github.com/coredns/corefile-migration/releases)
- [Commits](coredns/corefile-migration@v1.0.19...v1.0.20)

---
updated-dependencies:
- dependency-name: github.com/coredns/corefile-migration
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/MakeNowJust/heredoc v1.0.0
 	github.com/Masterminds/sprig/v3 v3.2.3
 	github.com/blang/semver v3.5.1+incompatible
-	github.com/coredns/corefile-migration v1.0.19
+	github.com/coredns/corefile-migration v1.0.20
 	github.com/davecgh/go-spew v1.1.1
 	github.com/docker/distribution v2.8.1+incompatible
 	github.com/drone/envsubst/v2 v2.0.0-20210730161058-179042472c46

go.sum

@@ -101,8 +101,8 @@ github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWH
 github.com/cncf/xds/go v0.0.0-20210805033703-aa0b78936158/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/coredns/caddy v1.1.0 h1:ezvsPrT/tA/7pYDBZxu0cT0VmWk75AfIaf6GSYCNMf0=
 github.com/coredns/caddy v1.1.0/go.mod h1:A6ntJQlAWuQfFlsd9hvigKbo2WS0VUs2l1e2F+BawD4=
-github.com/coredns/corefile-migration v1.0.19 h1:SrHdrObdIQptwyBSlcnSY0DbhWrHwJz2Vls6c6Rw2Xk=
-github.com/coredns/corefile-migration v1.0.19/go.mod h1:XnhgULOEouimnzgn0t4WPuFDN2/PJQcTxdWKC5eXNGE=
+github.com/coredns/corefile-migration v1.0.20 h1:MdOkT6F3ehju/n9tgxlGct8XAajOX2vN+wG7To4BWSI=
+github.com/coredns/corefile-migration v1.0.20/go.mod h1:XnhgULOEouimnzgn0t4WPuFDN2/PJQcTxdWKC5eXNGE=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-semver v0.1.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=