Update dependency browser-sync to v2.26.7

Author: renovate-bot

package.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "@types/jest": "23.1.1",
-    "browser-sync": "2.24.5",
+    "browser-sync": "2.26.7",
     "firebase-tools": "3.19.0",
     "jest": "23.1.0"
   },