build(deps): bump i18next from 23.14.0 to 23.15.1 in /frontend in the i18next group #6

Job	Run time
Check frontend style	1m 26s
Run `cargo deny` checks	37s
Check schema	13m 9s
Run the frontend test suite	1m 24s
Lint and test OPA policies	6s
Check Rust style	12s
Check syn2mas	34s
Run Clippy	7m 45s
Run test suite with Rust stable	16m 16s
Tests done	3s
	41m 32s

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