Release v3.6.2

 - Use python3 instead of python for Ubuntu 20.04 and Debian 11 compatibility.
   If you do not have python 3, you will have to change shebang in
   `scripts/get_lexer_list.py`. The script is still compatible with python 2.
 - Update CodeIgniter to latest master for some additional PHP 8.0 and 8.1 fixes
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