Bump datatables.net-fixedheader-bs4 from 3.2.4 to 3.3.1

Bumps [datatables.net-fixedheader-bs4](https://github.com/DataTables/Dist-DataTables-FixedHeader-Bootstrap4) from 3.2.4 to 3.3.1.
- [Release notes](https://github.com/DataTables/Dist-DataTables-FixedHeader-Bootstrap4/releases)
- [Commits](DataTables/Dist-DataTables-FixedHeader-Bootstrap4@3.2.4...3.3.1)

---
updated-dependencies:
- dependency-name: datatables.net-fixedheader-bs4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
         "datatables.net": "^1.13.1",
         "datatables.net-bs4": "^1.13.1",
         "datatables.net-fixedheader": "^3.3.1",
-        "datatables.net-fixedheader-bs4": "^3.2.4",
+        "datatables.net-fixedheader-bs4": "^3.3.1",
         "datatables.net-responsive": "^2.4.0",
         "datatables.net-responsive-bs4": "^2.3.0",
         "easymde": "^2.18.0",