Update vulnerable dependencies

[MatthewGentoo]

Update dependencies identified by cargo-audit as potentially vulnerable.

I don't think any of these impact weggli in any meaningful way, but I think it's nice to keep tools like cargo-audit happy so that if a genuine vulnerability shows up, it won't be hidden behind the noise of other irrelevant packages.

I've tested these updates by running the unit tests and then by running weggli itself - I haven't tested the Python bindings.

chrono: https://rustsec.org/advisories/RUSTSEC-2020-0159 nix: https://rustsec.org/advisories/RUSTSEC-2021-0119 regex: https://rustsec.org/advisories/RUSTSEC-2022-0013 time: https://rustsec.org/advisories/RUSTSEC-2020-0071

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[ZetaTwo]

Superseded by #67

[felixwilhelm]

Thanks for the PR @MatthewGentoo and sorry for not merging it earlier. I'll close this now as #67 already updated the vulnerable deps.