Update Rust crate flagset to 0.4.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
flagset	dependencies	patch	0.4.3 -> 0.4.4

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Release Notes

enarx/flagset (flagset)

### [`v0.4.4`](https://togithub.com/enarx/flagset/compare/v0.4.3...v0.4.4) [Compare Source](https://togithub.com/enarx/flagset/compare/v0.4.3...v0.4.4)

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