chore(deps): update rust crate ipnet to v2.12.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ipnet	build-dependencies	patch	2.12.0 → 2.12.1
ipnet	dependencies	patch	2.12.0 → 2.12.1

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Release Notes

krisprice/ipnet (ipnet)

v2.12.1

• Fixes bug where Ipv4Subnets(0.0.0.0, u32::MAX-1, 0) and Ipv6Subnets(::, u128::MAX-1, 0) incorrectly included u32::MAX and u128::MAX. See issue #​70.
• Fixes some typos in documentation and error messages

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