[6.0] efff5c5aa circleci: Update setup_remote_docker version

[Dridi Boukelmoune]

commit efff5c5aa04865d9a3ebef66788a13e83628a19f
Author: Guillaume Quintard <guillaume.quintard at varnish-software.com>
Date:   Sat Feb 24 15:52:39 2024 +0100

    circleci: Update setup_remote_docker version
    
    https://discuss.circleci.com/t/remote-docker-image-deprecations-and-eol-for-2024/50176

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 209b7f88d..519dadd0b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -222,8 +222,7 @@ jobs:
       - image: centos:7
     working_directory: /workspace
     steps:
-      - setup_remote_docker:
-          version: 20.10.11
+      - setup_remote_docker
       - run:
           name: Install docker
           command: yum install -y docker