build(deps): bump github.com/docker/docker (#1155)

Bumps [github.com/docker/docker](https://github.com/docker/docker) from 20.10.14+incompatible to 20.10.15+incompatible.
- [Release notes](https://github.com/docker/docker/releases)
- [Changelog](https://github.com/moby/moby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/docker/docker/compare/v20.10.14...v20.10.15)

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

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/andreaskoch/go-fswatch v1.0.0
 	github.com/docker/cli v20.10.15+incompatible
 	github.com/docker/distribution v2.8.1+incompatible
-	github.com/docker/docker v20.10.14+incompatible
+	github.com/docker/docker v20.10.15+incompatible
 	github.com/go-git/go-billy/v5 v5.3.1
 	github.com/go-git/go-git/v5 v5.4.2
 	github.com/go-ini/ini v1.66.4
@@ -47,7 +47,6 @@ require (
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
@@ -71,9 +70,6 @@ require (
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
 	golang.org/x/sys v0.0.0-20220405052023-b1e9470b6e64 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	google.golang.org/genproto v0.0.0-20220401170504-314d38edb7de // indirect
-	google.golang.org/grpc v1.45.0 // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 )