Update dependency react-intl to v5.15.6

Author: renovate-bot

package-lock.json

@@ -46,7 +46,7 @@
     "query-string": "7.0.0",
     "react": "17.0.2",
     "react-dom": "17.0.2",
-    "react-intl": "5.15.3",
+    "react-intl": "5.15.6",
     "react-redux": "7.2.3",
     "react-router": "5.2.0",
     "react-router-dom": "5.2.0",