Increase DELAY_UPTIME to 180 seconds

[DL6ER]

By submitting this pull request, I confirm the following (please check boxes, eg [X]) Failure to fill the template will close your PR:

Please submit all pull requests against the development branch. Failure to do so will delay or deny your request

• I have read and understood the contributors guide.
• I have checked that another pull request for this purpose does not exist.
• I have considered, and confirmed that this submission will be valuable to others.
• I accept that this submission may not be used, and the pull request closed at the will of the maintainer.
• I give this submission freely, and claim no ownership to its content.

How familiar are you with the codebase?: {replace this text with a number from 1 to 10, with 1 being not familiar, and 10 being very familiar}

---

Increase DELAY_UPTIME to 180 seconds to account for very slow systems

This template was created based on the work of udemy-dl.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/delay-startup-behavior-with-the-new-pi-hole-5-11/56446/17

[yubiuser]

Solves: https://discourse.pi-hole.net/t/delay-startup-behavior-with-the-new-pi-hole-5-11/56446

---

Adjusts: #1349