added admin notice and check compatibility with latest WP6.8.1

[Akhill2020]

Description: Added an admin notice to upgrade to PHP 8.x and check compatibility with the latest WP. After: https://www.screenpresso.com/=0U7Wwg2Xiil2

Summary by CodeRabbit

• New Features
  • Added an admin notice prompting users to upgrade PHP if their version is below 8.0, displaying the current PHP version.
• Documentation
  • Updated documentation to reflect compatibility with WordPress 6.8.1 and included a changelog entry for version 3.5.2.

[coderabbitai[bot]]

Walkthrough

The changes update the plugin's admin notice functionality to focus on PHP version requirements rather than checking for outdated add-ons. The function previously responsible for notifying about Pro and FullCalendar add-on updates has been renamed and repurposed to display a notice if the server's PHP version is below 8.0. Related logic for add-on version checks and options management was removed. Additionally, the plugin's readme was updated to reflect compatibility with WordPress 6.8.1 and to document the new PHP version notice in the changelog.

Changes

File(s)	Change Summary
includes/functions/admin.php	Renamed and repurposed the admin notice function to check for PHP version < 8.0; removed add-on version check logic; updated admin hook.
readme.txt	Updated "Tested up to" WordPress version to 6.8.1; added changelog entry for v3.5.2 noting compatibility and new PHP notice.

Suggested reviewers

• rosinghal

Poem

🐇
A hop and a skip through the admin den,
Out with old checks, in with PHP again!
If your version is low, a notice will show,
"Upgrade to eight-oh, let your site glow!"
WordPress is fresher, the changelog’s in sight—
The calendar’s ready, and all is right!
🕒✨

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Configuration used: CodeRabbit UI Review profile: CHILL Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0d5c25556947d06746fa7b853f31e6f3954c18fc and 15a1fae8e3de29f9380bda761d9e7036a37a3ba2.

📒 Files selected for processing (1)

• includes/functions/admin.php (2 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• includes/functions/admin.php

✨ Finishing Touches

• [ ] 📝 Generate Docstrings

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[Dr-Mx]

FYI My current PHP version is 8.3.20 and I'm getting this warning.

[rosinghal]

@Dr-Mx thanks for letting us know, we are looking into this. @Akhill2020 @gacharijohn FYI

[rosinghal]

@Dr-Mx fixed in https://github.com/Xtendify/Simple-Calendar/pull/615