[6.0] update JOOMLA_MINIMUM_PHP

[heelc29]

Summary of Changes

PROD2025/007 Set minimum supported PHP version for Joomla! 6.0 to 8.3.0 Report

update EOS date of quickiconRoadmap

Testing Instructions

use older PHP version then 8.3

Actual result BEFORE applying this Pull Request

No message when working below PHP 8.3 (eg. 8.2.29)

Expected result AFTER applying this Pull Request

Message that only PHP 8.3 and above is working

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[Hackwar]

Thank you for this PR. While I agree with it, I also think that we should combine it with #45726. For that, we first have to reach a stable state for the framework packages and do releases of them all as 4.0.

[Hackwar]

I have tested this item ✅ successfully on 5337d9f

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[Hackwar]

This PR is necessary for #45827. Please test and lets get this moving. :-)

[RickR2H]

I have tested this item ✅ successfully on 5337d9f

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[RickR2H]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45746.}

[Hackwar]

rtc

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[Bodge-IT]

Thanks @heelc29 for your work on this and thanks to the testers @Hackwar & @RickR2H for your testing time.