vendor: update docker/docker to c752b0991e31ba9869ab6a0661af57e9423874fb

Signed-off-by: Tibor Vass <[email protected]>

Author: Tibor Vass

vendor.conf

@@ -6,7 +6,7 @@ github.com/coreos/etcd v3.2.1
 github.com/cpuguy83/go-md2man v1.0.8
 github.com/davecgh/go-spew 346938d642f2ec3594ed81d874461961cd0faa76
 github.com/docker/distribution 83389a148052d74ac602f5f1d62f86ff2f3c4aa5
-github.com/docker/docker experimental-buildkit https://github.com/tonistiigi/docker
+github.com/docker/docker c752b0991e31ba9869ab6a0661af57e9423874fb
 github.com/docker/docker-credential-helpers 3c90bd29a46b943b2a9842987b58fb91a7c1819b
 # the docker/go package contains a customized version of canonical/json
 # and is used by Notary. The package is periodically rebased on current Go versions.