SSLH Update to v2.1.2

[efaden]

Important notices
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• I have read the contributing guide lines at https://github.com/opnsense/plugins/blob/master/CONTRIBUTING.md
• I have searched the existing issues, open and closed, and I'm convinced that mine is new.
• When the request is meant for an existing plugin, I've added its name to the title.

Is your feature request related to a problem? Please describe.
Feature, or rather a plugin version update. The latest version of sslh has a vulnerability fix as well as allowing UDP now.

Describe the solution you'd like
Update sslh to version 2.1.2

Describe alternatives you've considered
Using sslh on another machine and using a port forward.

Additional context
Add any other context or screenshots about the feature request here.

[fichtner]

We're just following the FreeBSD ports. If anyone wants to prod there be my guest.

[doktornotor]

Looks like it's already there, can be closed. 😉

 # pkg install sslh
Updating OPNsense repository catalogue...
OPNsense repository is up to date.
All repositories are up to date.
The following 3 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
        libconfig: 1.7.3 [OPNsense]
        libev: 4.33_1,1 [OPNsense]
        sslh: 2.1.2 [OPNsense]

Number of packages to be installed: 3

The process will require 1 MiB more space.
289 KiB to be downloaded.