update docker/distribution lib

Signed-off-by: Hilário Coelho <hilario.coelho@securityside.com>

gateway/go.mod

@@ -3,7 +3,7 @@ module github.com/openfaas/faas/gateway
 go 1.16
 
 require (
-	github.com/docker/distribution v2.7.1+incompatible
+	github.com/docker/distribution v2.8.1+incompatible
 	github.com/gorilla/mux v1.8.0
 	github.com/hashicorp/golang-lru v0.5.1 // indirect
 	github.com/openfaas/faas-provider v0.18.7

gateway/go.sum

@@ -18,8 +18,8 @@ github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/docker/distribution v2.7.1+incompatible h1:a5mlkVzth6W5A4fOsS3D2EO5BUmsJpcB+cRlLU7cSug=
-github.com/docker/distribution v2.7.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/distribution v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68=
+github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=

gateway/vendor/modules.txt

@@ -2,7 +2,7 @@
 github.com/beorn7/perks/quantile
 # github.com/cespare/xxhash/v2 v2.1.1
 github.com/cespare/xxhash/v2
-# github.com/docker/distribution v2.7.1+incompatible
+# github.com/docker/distribution v2.8.1+incompatible
 ## explicit
 github.com/docker/distribution/uuid
 # github.com/gogo/protobuf v1.3.2