Bump System.Reactive from 5.0.0 to 6.0.0 (#244)

* Bump System.Reactive from 5.0.0 to 6.0.0

Bumps [System.Reactive](https://github.com/dotnet/reactive) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/dotnet/reactive/releases)
- [Commits](https://github.com/dotnet/reactive/commits)

---
updated-dependencies:
- dependency-name: System.Reactive
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update changelog & packages.lock.json

Signed-off-by: dependabot[bot] <support@github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -27,6 +27,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Bumps `Fake.IO.FileSystem` from 5.23.1 to 6.0.0
 - Bumps `Microsoft.SourceLink.GitHub` from 1.0.0 to 1.1.1
 - Bumps `System.Diagnostics.DiagnosticSource` from 6.0.0 to 6.0.1
+- Bumps `System.Reactive` from 5.0.0 to 6.0.0
 
 ## [1.3.0]
 ### Added

tests/Tests/Tests.csproj

@@ -17,7 +17,7 @@
     <ProjectReference Include="$(SolutionRoot)\tests\Tests.Core\Tests.Core.csproj" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
     <PackageReference Include="FSharp.Core" Version="7.0.300" />
-    <PackageReference Include="System.Reactive" Version="5.0.0" />
+    <PackageReference Include="System.Reactive" Version="6.0.0" />
     <PackageReference Include="SemanticVersioning" Version="2.0.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageReference Include="Ben.Demystifier" Version="0.4.1" />

tests/Tests/packages.lock.json

@@ -44,9 +44,9 @@
       },
       "System.Reactive": {
         "type": "Direct",
-        "requested": "[5.0.0, )",
-        "resolved": "5.0.0",
-        "contentHash": "erBZjkQHWL9jpasCE/0qKAryzVBJFxGHVBAvgRN1bzM0q2s1S4oYREEEL0Vb+1kA/6BKb5FjUZMp5VXmy+gzkQ=="
+        "requested": "[6.0.0, )",
+        "resolved": "6.0.0",
+        "contentHash": "31kfaW4ZupZzPsI5PVe77VhnvFF55qgma7KZr/E0iFTs6fmdhhG8j0mgEx620iLTey1EynOkEfnyTjtNEpJzGw=="
       },
       "xunit.runner.visualstudio": {
         "type": "Direct",