Bump ag-grid-community from 23.2.0 to 31.3.4 in /traffic_portal

Bumps [ag-grid-community](https://github.com/ag-grid/ag-grid) from 23.2.0 to 31.3.4.
- [Release notes](https://github.com/ag-grid/ag-grid/releases)
- [Commits](ag-grid/ag-grid@v23.2.0...v31.3.4)

---
updated-dependencies:
- dependency-name: ag-grid-community
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

traffic_portal/package-lock.json

@@ -50,7 +50,7 @@
   },
   "dependencies": {
     "@uirouter/angularjs": "0.4.3",
-    "ag-grid-community": "23.2.0",
+    "ag-grid-community": "31.3.4",
     "angular": "1.8.3",
     "angular-animate": "1.8.3",
     "angular-bootstrap-contextmenu": "1.2.1",