Prevent bash process substitution error in cygwin

Signed-off-by: Matteo Orefice <matteo.orefice@bites4bits.software>
(cherry picked from commit 0b49495b1d)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

contrib/completion/bash/docker

@@ -570,7 +570,7 @@ __docker_append_to_completions() {
 # The result is cached for the duration of one invocation of bash completion.
 __docker_fetch_info() {
 	if [ -z "$info_fetched" ] ; then
-		read -r client_experimental server_experimental server_os < <(__docker_q version -f '{{.Client.Experimental}} {{.Server.Experimental}} {{.Server.Os}}')
+		read -r client_experimental server_experimental server_os <<< "$(__docker_q version -f '{{.Client.Experimental}} {{.Server.Experimental}} {{.Server.Os}}')"
 		info_fetched=true
 	fi
 }