vendor.mod: bump go line to 1.20

Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>

hack/with-go-mod.sh

@@ -25,7 +25,7 @@ else
 	tee "${ROOTDIR}/go.mod" >&2 <<- EOF
 		module github.com/docker/docker
 
-		go 1.19
+		go 1.20
 	EOF
 	trap 'rm -f "${ROOTDIR}/go.mod"' EXIT
 fi

vendor.mod

@@ -4,7 +4,7 @@
 
 module github.com/docker/docker
 
-go 1.18
+go 1.20
 
 require (
 	cloud.google.com/go/compute/metadata v0.2.3