[SignatureBot] Add or update signature nucleitemplates_uptimerobot-takeover.yml

[liquidsec]

Add or update signature: nucleitemplates_uptimerobot-takeover.yml

This PR adds or updates the follow signature:

identifiers:
  cnames: []
  ips: []
  nameservers: []
  not_cnames: []
matcher_rule:
  matchers:
  - dsl:
    - Host != ip
    type: dsl
  - regex:
    - ^page not found$
    type: regex
  - case-insensitive: true
    condition: and
    part: header
    type: word
    words:
    - 'Server: Caddy'
  - status: 404
    type: status
  matchers-condition: and
mode: http
service_name: uptimerobot takeover detection
source: nucleitemplates

[liquidsec]

blocking signature due to lack of impact, per discussion here:

https://github.com/EdOverflow/can-i-take-over-xyz/issues/45

[liquidsec]

closing