Bump NetMQ from 4.0.1.6 to 4.0.1.8

Created by: dependabot[bot]

Bumps NetMQ from 4.0.1.6 to 4.0.1.8.

Release notes

Sourced from NetMQ's releases.

v4.0.1.8

• Bump some package versions
• Deterministic build (more info)
• Fix some nullable annotations

v4.0.1.7

No release notes provided.

Commits

• 0b58c23 Merge pull request #999 from drewnoakes/bump-versions
• d934760 Remove unused property
• 7b25cea Add GitHub actions CI badge
• 412b75d Update GitHub CI workflow
• 4e4ca78 Use singleton event args
• ede1fec Formatting
• 77187ef Remove unused local
• e278572 Fix more nullability warnings after updating to net6.0
• 0907ab2 Update out-of-support runtime for test projects
• 6def659 Fix nullability warnings and annotations
• Additional commits viewable in compare view

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