deps: bump the dependency-updates group with 2 updates

Bumps the dependency-updates group with 2 updates: [datatables.net](https://github.com/DataTables/Dist-DataTables) and [datatables.net-bs4](https://github.com/DataTables/Dist-DataTables-Bootstrap4).


Updates `datatables.net` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/DataTables/Dist-DataTables/releases)
- [Commits](DataTables/Dist-DataTables@2.1.5...2.1.6)

Updates `datatables.net-bs4` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/DataTables/Dist-DataTables-Bootstrap4/releases)
- [Commits](DataTables/Dist-DataTables-Bootstrap4@2.1.5...2.1.6)

---
updated-dependencies:
- dependency-name: datatables.net
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependency-updates
- dependency-name: datatables.net-bs4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependency-updates
...

Signed-off-by: dependabot[bot] <support@github.com>