Update VS Code container

Author: colemancda

.devcontainer/Dockerfile

@@ -1,5 +1,5 @@
 # [Choice] Swift version: 5.6-focal, 5.5, 5.4, 5.3, 5.2, 5.1, 4.2
-ARG VARIANT=5.8-jammy
+ARG VARIANT=6.0.3-jammy
 FROM swift:${VARIANT}
 
 # [Option] Install zsh

.devcontainer/devcontainer.json

@@ -6,7 +6,7 @@
 		"dockerfile": "Dockerfile",
 		"args": {
 			// Update the VARIANT arg to pick a Swift version 
-			"VARIANT": "5.8-jammy",
+			"VARIANT": "6.0.3-jammy",
 			// Options
 			"NODE_VERSION": "lts/*",
 			"UPGRADE_PACKAGES": "true"