Bump ReactiveMarbles.ObservableEvents.SourceGenerator (#1449)

Bumps [ReactiveMarbles.ObservableEvents.SourceGenerator](https://github.com/reactivemarbles/ObservableEvents) from 1.1.3 to 1.1.4.
- [Release notes](https://github.com/reactivemarbles/ObservableEvents/releases)
- [Commits](https://github.com/reactivemarbles/ObservableEvents/compare/1.1.3...1.1.4)

---
updated-dependencies:
- dependency-name: ReactiveMarbles.ObservableEvents.SourceGenerator
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

ReactiveExample/ReactiveExample.csproj

@@ -8,7 +8,7 @@
         <PackageReference Include="ReactiveUI" Version="14.2.1" />
         <PackageReference
             Include="ReactiveMarbles.ObservableEvents.SourceGenerator"
-            Version="1.1.3"
+            Version="1.1.4"
             PrivateAssets="all" />
     </ItemGroup>
     <ItemGroup>