Update dependency fast_gettext to v3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
fast_gettext	'2.3.0' -> '3.0.0'

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Release Notes

grosser/fast_gettext (fast_gettext)

### [`v3.0.0`](https://togithub.com/grosser/fast_gettext/compare/v2.4.0...v3.0.0) [Compare Source](https://togithub.com/grosser/fast_gettext/compare/v2.4.0...v3.0.0) ### [`v2.4.0`](https://togithub.com/grosser/fast_gettext/compare/v2.3.0...v2.4.0) [Compare Source](https://togithub.com/grosser/fast_gettext/compare/v2.3.0...v2.4.0)

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