Update go-proxyproto to v0.6.0

From https://github.com/pires/go-proxyproto/releases:

Prevent potentially malicious client(s) from opening connections and not
send the proxy protocol header, which could lead to DoS as the server
would hold those socket descriptors open indefinitely, eventually
running out of resources. The solution is to set a read deadline when
waiting for the PROXY protocol header:
pires/go-proxyproto#74

Author: stanhu

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/mattn/go-shellwords v1.0.11
 	github.com/mikesmitty/edkey v0.0.0-20170222072505-3356ea4e686a
 	github.com/otiai10/copy v1.4.2
-	github.com/pires/go-proxyproto v0.5.0
+	github.com/pires/go-proxyproto v0.6.0
 	github.com/prometheus/client_golang v1.10.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0

go.sum

@@ -505,8 +505,8 @@ github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1/go.mod h1:3/3N9NVKO0
 github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pingcap/errors v0.11.4 h1:lFuQV/oaUMGcD2tqt+01ROSmJs75VG1ToEOkZIZ4nE4=
 github.com/pingcap/errors v0.11.4/go.mod h1:Oi8TUi2kEtXXLMJk9l1cGmz20kV3TaQ0usTwv5KuLY8=
-github.com/pires/go-proxyproto v0.5.0 h1:A4Jv4ZCaV3AFJeGh5mGwkz4iuWUYMlQ7IoO/GTuSuLo=
-github.com/pires/go-proxyproto v0.5.0/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
+github.com/pires/go-proxyproto v0.6.0 h1:cLJUPnuQdiNf7P/wbeOKmM1khVdaMgTFDLj8h9ZrVYk=
+github.com/pires/go-proxyproto v0.6.0/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
 github.com/pkg/errors v0.0.0-20170505043639-c605e284fe17/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=