[SignatureBot] Add or update signature dnsreaper_bettermode.yml

[liquidsec]

Add or update signature: dnsreaper_bettermode.yml

This PR adds or updates the follow signature:

identifiers:
  cnames:
  - type: word
    value: domains.bettermode.io
  ips: []
  nameservers: []
  not_cnames: []
matcher_rule:
  matchers:
  - status: 409
    type: status
  matchers-condition: and
mode: http
service_name: bettermode.com
source: dnsreaper