Bump MongoDB.Driver in /src/providers/WorkflowCore.Persistence.MongoDB

Bumps [MongoDB.Driver](https://github.com/mongodb/mongo-csharp-driver) from 2.8.1 to 2.19.0.
- [Release notes](https://github.com/mongodb/mongo-csharp-driver/releases)
- [Commits](mongodb/mongo-csharp-driver@v2.8.1...v2.19.0)

---
updated-dependencies:
- dependency-name: MongoDB.Driver
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/providers/WorkflowCore.Persistence.MongoDB/WorkflowCore.Persistence.MongoDB.csproj

@@ -22,7 +22,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="MongoDB.Driver" Version="2.8.1" />
+    <PackageReference Include="MongoDB.Driver" Version="2.19.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
   </ItemGroup>