improve trusted JSON schemas (#296928)

* improve trusted JSON schemas

* update

Author: aeschli

extensions/json-language-features/package.json

@@ -131,10 +131,12 @@
           "type": "object",
           "default": {
             "https://schemastore.azurewebsites.net/": true,
-            "https://raw.githubusercontent.com/": true,
+            "https://raw.githubusercontent.com/microsoft/vscode/": true,
+            "https://raw.githubusercontent.com/devcontainers/spec/": true,
             "https://www.schemastore.org/": true,
             "https://json.schemastore.org/": true,
-            "https://json-schema.org/": true
+            "https://json-schema.org/": true,
+            "https://developer.microsoft.com/json-schemas/": true
           },
           "additionalProperties": {
             "type": "boolean"