Bump FluentAssertions from 5.7.0 to 5.8.0 in /Ix.NET/Source

[dependabot-preview]

Bumps FluentAssertions from 5.7.0 to 5.8.0.

Release notes

Sourced from FluentAssertions's releases.

5.8.0

Release Notes

Commits

• 070aa6c Release notes for 5.8 (#1111)
• ee7abf8 Styling (#1109)
• 77b541b Add global warning ignores
• 7340a6d do not cast return value
• f152bc5 discards
• 2900eb9 simplify xml docs
• 06ee162 Remove prefixes from cref
• 8f09d7a make private methods static
• 8cc1651 ignore warnings
• ce73978 attribute annotation
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #1001 into master will decrease coverage by 19.78%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1001       +/-   ##
===========================================
- Coverage   83.85%   64.06%   -19.79%     
===========================================
  Files         443      165      -278     
  Lines       62959    24805    -38154     
  Branches    28321    17333    -10988     
===========================================
- Hits        52793    15891    -36902     
+ Misses       3216     2238      -978     
+ Partials     6950     6676      -274

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

Impacted Files	Coverage Δ
.../Source/src/System.Reactive/Linq/Observable/Zip.cs
...eactive/Concurrency/Synchronization.Synchronize.cs
.../System.Reactive/Concurrency/SchedulerOperation.cs
...Source/src/System.Reactive/Linq/Observable/Case.cs
...ource/src/System.Reactive/Linq/Observable/Merge.cs
...src/System.Reactive/Linq/QueryLanguage.Multiple.cs
...ce/src/System.Reactive/Linq/QueryLanguage.Joins.cs
...NET/Source/src/System.Reactive/Joins/ActivePlan.cs
...Source/src/System.Reactive/Linq/QueryLanguageEx.cs
...System.Reactive/Concurrency/HistoricalScheduler.cs
... and 268 more

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[dependabot-preview]

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• codecov/project/ixnet

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[clairernovotny]

@dependabot rebase