Bump CodeIgniter to 4.5.1

- CodeIgniter 4.5.1
- PSR/Log 3.0.0
- PHP >= 8.1
- Replaced mandatory files.
- Modified breaking change code.
- Modified updated code.
- Added missing files.

Signed-off-by: objecttothis <objecttothis@gmail.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f