Merge pull request #1340 from github/henrymercer/fix-proxy-check

Fix missing Docker image in proxy test

Author: henrymercer

.github/workflows/__test-proxy.yml

@@ -3,11 +3,11 @@ description: "Tests using a proxy specified by the https_proxy environment varia
 versions: ["latest"]
 operatingSystems: ["ubuntu"]
 container:
-  image: ubuntu:18.04
+  image: ubuntu:22.04
   options: --dns 127.0.0.1
 services:
   squid-proxy:
-    image: datadog/squid:latest
+    image: ubuntu/squid:latest
     ports:
       - 3128:3128
 env: