fix(deps): update rust crate rust-ini to 0.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
rust-ini	dependencies	minor	0.19.0 -> 0.21.0

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Release Notes

zonyitoo/rust-ini (rust-ini)

### [`v0.21.0`](https://togithub.com/zonyitoo/rust-ini/releases/tag/v0.21.0) [Compare Source](https://togithub.com/zonyitoo/rust-ini/compare/v0.20.0...v0.21.0) #### What's Changed - Add iter_mut() and into_iter() to Properties by [@​arucil](https://togithub.com/arucil) in [https://github.com/zonyitoo/rust-ini/pull/118](https://togithub.com/zonyitoo/rust-ini/pull/118) - Use a Cow<'static, str> for ParseError by [@​GnomedDev](https://togithub.com/GnomedDev) in [https://github.com/zonyitoo/rust-ini/pull/121](https://togithub.com/zonyitoo/rust-ini/pull/121) - Updating README usage version to 0.20 by [@​BigBallard](https://togithub.com/BigBallard) in [https://github.com/zonyitoo/rust-ini/pull/125](https://togithub.com/zonyitoo/rust-ini/pull/125) - Fix clippy warnings by [@​GnomedDev](https://togithub.com/GnomedDev) in [https://github.com/zonyitoo/rust-ini/pull/120](https://togithub.com/zonyitoo/rust-ini/pull/120) - Add inline(never) to Parser::error by [@​GnomedDev](https://togithub.com/GnomedDev) in [https://github.com/zonyitoo/rust-ini/pull/122](https://togithub.com/zonyitoo/rust-ini/pull/122) - Avoid reallocating for trimming by [@​GnomedDev](https://togithub.com/GnomedDev) in [https://github.com/zonyitoo/rust-ini/pull/124](https://togithub.com/zonyitoo/rust-ini/pull/124) #### New Contributors - [@​arucil](https://togithub.com/arucil) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/118](https://togithub.com/zonyitoo/rust-ini/pull/118) - [@​GnomedDev](https://togithub.com/GnomedDev) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/121](https://togithub.com/zonyitoo/rust-ini/pull/121) - [@​BigBallard](https://togithub.com/BigBallard) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/125](https://togithub.com/zonyitoo/rust-ini/pull/125) **Full Changelog**: https://github.com/zonyitoo/rust-ini/compare/v0.20.0...v0.21.0 ### [`v0.20.0`](https://togithub.com/zonyitoo/rust-ini/releases/tag/v0.20.0) [Compare Source](https://togithub.com/zonyitoo/rust-ini/compare/v0.19.0...v0.20.0) #### What's Changed - Fix clippy warnings by [@​crapStone](https://togithub.com/crapStone) in [https://github.com/zonyitoo/rust-ini/pull/110](https://togithub.com/zonyitoo/rust-ini/pull/110) - Add support for custom key-value separator in nameless sections. by [@​LostSnail42](https://togithub.com/LostSnail42) in [https://github.com/zonyitoo/rust-ini/pull/112](https://togithub.com/zonyitoo/rust-ini/pull/112) - Update ordered-multimap dependency by [@​loewenheim](https://togithub.com/loewenheim) in [https://github.com/zonyitoo/rust-ini/pull/115](https://togithub.com/zonyitoo/rust-ini/pull/115) #### New Contributors - [@​crapStone](https://togithub.com/crapStone) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/110](https://togithub.com/zonyitoo/rust-ini/pull/110) - [@​LostSnail42](https://togithub.com/LostSnail42) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/112](https://togithub.com/zonyitoo/rust-ini/pull/112) - [@​loewenheim](https://togithub.com/loewenheim) made their first contribution in [https://github.com/zonyitoo/rust-ini/pull/115](https://togithub.com/zonyitoo/rust-ini/pull/115) **Full Changelog**: https://github.com/zonyitoo/rust-ini/compare/v0.19.0...v0.20.0

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