Update NUnit3TestAdapter requirement from 4.2.* to 4.3.*

[dependabot[bot]]

Updates the requirements on NUnit3TestAdapter to permit the latest version.

Release notes

Sourced from NUnit3TestAdapter's releases.

V4.3.0

See release notes here

Commits

• 2d1b1bf Prepare 4.3.0 (#1024)
• da0a5c3 Bump NUnit.Analyzers from 3.3.0 to 3.5.0 (#1023)
• ea43ef8 Fix for #997 (#1001)
• 54262a6 update src folder links (#1019)
• 52f05c9 Dependabot/nuget/nunit.engine 3.15.2 (#995)
• adef940 Bump NSubstitute from 4.3.0 to 4.4.0 (#994)
• 55a4ee4 Bump nunit.engine from 3.15.0 to 3.15.2 (#989)
• 5d5b5de fix for issue 990 (#992)
• 6a6e422 Unescape \u in test output so ANSI color codes can be interpreted correctly ...
• be785cd Bump StyleCop.Analyzers from 1.2.0-beta.376 to 1.2.0-beta.435 (#979)
• Additional commits viewable in compare view

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