Change http to https for schemastore.org (#1512)

#1027

See:
- microsoft/vscode#40736
- https://github.com/microsoft/vscode/pull/40737/files

package-json-schema.json

@@ -1,9 +1,9 @@
 {
-	"$schema": "http://json-schema.org/draft-07/schema",
+	"$schema": "https://json-schema.org/draft-07/schema",
 	"properties": {
 		"eslintConfig": {
 			"description": "ESLint configuration",
-			"$ref": "http://json.schemastore.org/eslintrc"
+			"$ref": "https://json.schemastore.org/eslintrc"
 		}
 	}
-}
+}