Bump datatables.net from 2.1.8 to 2.2.1

Bumps [datatables.net](https://github.com/DataTables/Dist-DataTables) from 2.1.8 to 2.2.1.
- [Release notes](https://github.com/DataTables/Dist-DataTables/releases)
- [Commits](DataTables/Dist-DataTables@2.1.8...2.2.1)

---
updated-dependencies:
- dependency-name: datatables.net
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -6,7 +6,7 @@
     "doc": "doc"
   },
   "dependencies": {
-    "datatables.net": "2.1.8",
+    "datatables.net": "2.2.1",
     "datatables.net-bs5": "2.1.8",
     "datatables.net-buttons": "3.2.0",
     "datatables.net-buttons-bs5": "3.2.0",