security/crowdsec: add some detection for opnsense

[sabban]

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[sopex]

@fichtner Tagging you because the title here doesn't help.

[fichtner]

@sabban what happened to Marco? Can you send me a mail to franco AT opnsense DOT org from your crowdsec mail for verification please?

[fichtner]

you either want to make a new version or at least add a PLUGIN_REVISION=1 here