Bump github.com/docker/cli

Bumps [github.com/docker/cli](https://github.com/docker/cli) from 20.10.20+incompatible to 20.10.21+incompatible.
- [Release notes](https://github.com/docker/cli/releases)
- [Commits](docker/cli@v20.10.20...v20.10.21)

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

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

go.mod

@@ -4,7 +4,7 @@ go 1.19
 
 require (
 	github.com/MakeNowJust/heredoc v1.0.0
-	github.com/docker/cli v20.10.20+incompatible
+	github.com/docker/cli v20.10.21+incompatible
 	github.com/docker/docker v20.10.21+incompatible
 	github.com/moby/moby v20.10.20+incompatible
 	github.com/moby/sys/signal v0.7.0

go.sum

@@ -10,8 +10,8 @@ github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ
 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/cli v20.10.20+incompatible h1:lWQbHSHUFs7KraSN2jOJK7zbMS2jNCHI4mt4xUFUVQ4=
-github.com/docker/cli v20.10.20+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
+github.com/docker/cli v20.10.21+incompatible h1:qVkgyYUnOLQ98LtXBrwd/duVqPT2X4SHndOuGsfwyhU=
+github.com/docker/cli v20.10.21+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
 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/docker/docker v20.10.21+incompatible h1:UTLdBmHk3bEY+w8qeO5KttOhy6OmXWsl/FEet9Uswog=