Bump System.Reactive from 5.0.0 to 6.0.0

[dependabot[bot]]

Bumps System.Reactive from 5.0.0 to 6.0.0.

Release notes

Sourced from System.Reactive's releases.

Rx.NET v6.0.0-preview.16

Changes:

Bugs:

• #1626: Fix duplicate emission in Delay with immediate selector

Enhancement:

• #1879: Add Rx.NET 2023 roadmap, and tooling update ADR
• #1700: Add MinByWithTies and MaxByWithTies to bring back a MinBy/MaxBy that returns a list

Others:

• #1933: Update README and related docs
• #1930: Update NuGet refs
• #1928: Feature/1898 fix diagnostics
• #1916: Use snupkg instead of embedded symbols

• #1915: Remove obsolete #if directives
• #1630: exposing SingleAssignmentDisposableValue and making it ICancelable
• #1914: Allow opt-out from TaskScheduler.UnobservedExceptions
• #1827: Bump Nerdbank.GitVersioning from 3.4.255 to 3.5.119 in /Rx.NET/Source
• #1823: remove broken link (ruby implementation)
• #1906: Enable trimming in .NET 6 targets
• #1883: Replace xUnit with mstest
• #1449: Bump Microsoft.NET.Test.Sdk from 16.8.0 to 16.8.3 in /Rx.NET/Source
• #1901: Back out #1449
• #1893: Revert change that instructs you to target netX.0-windows10.0.19041
• #1899: Fix compiler diagnostics in AsyncRx.NET
• #1896: Merge AsyncRx.NET assemblies
• #1888: Add AsyncRx.NET build pipeline
• #1886: Set Rx vnext to 6.0 and add versioning ADR
• #1882: Upgrade to supported TFMs and SDK versions
• #1717: Update Observable.Single.cs
• #1731: Change master to main into PR template
• #1701: Include icon in package & fix a couple warnings
• #1681: Bump Nerdbank.GitVersioning from 3.4.244 to 3.4.255 in /Ix.NET/Source
• #1680: Bump Nerdbank.GitVersioning from 3.4.244 to 3.4.255 in /Rx.NET/Source
• #1684: Update Merge.cs
• #1688: Bump FluentAssertions from 6.2.0 to 6.4.0 in /Ix.NET/Source
• #1694: Bump coverlet.collector from 3.1.0 to 3.1.1 in /Ix.NET/Source
• #1696: Bump coverlet.collector from 3.1.0 to 3.1.1 in /Rx.NET/Source

... (truncated)

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