Bump Go version to 1.22 in dev containers config (prebid#3983)

Author: sebhtml

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
 		"dockerfile": "Dockerfile",
 		"args": {
 			// Update the VARIANT arg to pick a version of Go
-			"VARIANT": "1.20",
+			"VARIANT": "1.22",
 			// Options
 			"INSTALL_NODE": "false",
 			"NODE_VERSION": "lts/*"