Bump FluentAssertions from 5.6.0 to 5.7.0 in /Ix.NET/Source

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Bumps FluentAssertions from 5.6.0 to 5.7.0.

Release notes

Sourced from FluentAssertions's releases.

5.7.0

Release Notes

Commits

• 9852f6a Rework on async function assertions (#1079)
• e67e913 The Github PR template was still mentioning a branch
• 895ba26 Removes the dependency on timing aspects from the specs.
• 2bd7ed1 Fixed a static mutable state problem under .NET Core 3.0.
• 1fe7e1b Styling consistency (#1072)
• e0af27c Replace == null with is null (#1073)
• 3d6ac5a Implement NotBeEquivalent for objects (#1071)
• 9fc536b Fix: ( -> ; (#1075)
• 0474728 Fix for ThrowExactly and ThrowExactlyAsync not working with AggregateExceptio...
• 69ff8a1 Add tests to catch mutations (#1069)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #953 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #953   +/-   ##
=======================================
  Coverage   64.06%   64.06%           
=======================================
  Files         165      165           
  Lines       24805    24805           
  Branches    17333    17333           
=======================================
  Hits        15891    15891           
  Misses       2238     2238           
  Partials     6676     6676

Flag	Coverage Δ
#ixnet	64.06% <ø> (ø)	⬆️

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