security/metasploit: Fix crash at start

Fix crash at start due to issues with dependencies:

Could not find compatible versions

Because every version of sinatra depends on rack >= 3.0.0, < 4

and every version of thin depends on rack >= 1, < 3,
every version of sinatra is incompatible with thin >= 0.

And because every version of metasploit-framework depends on thin >= 0,

every version of sinatra is incompatible with metasploit-framework >= 0.

So, because every version of metasploit-framework depends on sinatra >= 0

and Gemfile depends on metasploit-framework >= 0,
version solving has failed.

PR: 278534
Reported by: d0wq92 <dimoj30024@picdv.com>