Update dependency browser-sync to v2.29.3

Author: renovate[bot]

package.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "@types/jest": "23.1.1",
-    "browser-sync": "2.24.5",
+    "browser-sync": "2.29.3",
     "firebase-tools": "3.19.0",
     "jest": "23.1.0"
   },