fix 2 vulnerabilities introduced by y18n@4.0.0 (#84)

vscode-extension/package-lock.json

@@ -2136,10 +2136,9 @@
 			}
 		},
 		"y18n": {
-			"version": "4.0.0",
-			"resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-			"integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-			"dev": true
+			"version": "4.0.3",
+			"resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+			"integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ=="
 		},
 		"yargs": {
 			"version": "13.3.2",