refactor: cleanup deprecations in `CodeIgniter` #14293

Job	Run time
Setup PHP Version for Code Coverage	3s
Others (8.4) / Sanity Tests	1m 1s
Others (8.5) / Sanity Tests	52s
Others (8.2) / Sanity Tests	1m 3s
Others (8.3) / Sanity Tests	35s
DatabaseLive	0s
SeparateProcess	0s
CacheLive	0s
Upload coverage results to Coveralls	0s
	3m 34s

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