Update the postinstall to the latest news on Joomla 4.0

[zero-24]

Summary of Changes

Update the postinstall to the latest news on Joomla 4.0 for PHP fixes #17547

Testing Instructions

Install Joomla on an non php 7 install

Expected result

Postinstall poping up

Actual result

postinstall come only when you are on lower than 5.5.9

Documentation Changes Required

New minimum as of https://developer.joomla.org/news/704-looking-forward-with-joomla-4.html

[brianteeman]

Do we need the comment about ext/mysql? Isn't that completely removed in PHP 7

[mbabker]

It's correct. It's saying ext/mysql support is dropped and to use MySQL you have to use one of the other adapters.

[brianteeman]

OK

[brianteeman]

I have tested this item ✅ successfully on 7146496

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/17549.}

[Quy]

I have tested this item ✅ successfully on e9f31bc

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/17549.}

[CiverBlack]

I have tested this item ✅ successfully on e9f31bc

I tried the public release and could reproduce the problem. With the patched version it works.
@icampus

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/17549.}

[ghost]

RTC after two successful tests.