Remove official support for older ESP32 IDF versions: 4.3, 4.4 and 5.0.

[slaff]

It is highly recommended to upgrade to version 5.2 if not done yet.
Related to #2732.

[what-the-diff]

PR Summary

• Updated GitHub Actions CI workflow for ESP32

  • The continuous integration (CI) workflow has been simplified on ESP32 by supporting only newer version 5.2, and no longer older versions 4.3 and 4.4, making workflow more manageable. The Python setup too has been streamlined to always use version 3.12.

• Modifications on library workflow

  • The changes include a switch to use only the default IDF version (5.2), removing the constraints that were previously associated with the older versions, beneficial in terms of efficiency and ease of use.

• Readme file updates

  • The README has been updated to reflect the new focus on version 5.2. User guidance now specifically indicates discontinuation of support for older versions (4.3, 4.4, 5.0), ensuring users always have the most relevant and up-to-date information.

• Warnings in the makefile

  • Notifications in the makefile have been rephrased to underline the importance of upgrading to version 5.2. This will help avoid confusion or issues due to outdated IDF versions.