Change location of contributing devcontainer.json file to improve default codespace experience. (#7704)

Author: mitchdenny

.devcontainer/contributing/devcontainer.json renamed to .devcontainer/devcontainer.json

@@ -11,7 +11,7 @@
 		"ghcr.io/devcontainers/features/dotnet": {
 			"additionalVersions": [
 				"8.0.403"
-			],
+			]
 		},
 		"ghcr.io/devcontainers/features/node:1": {},
 		"ghcr.io/devcontainers/features/python:1": {},