Bump Microsoft.Extensions.Hosting from 3.1.7 to 3.1.9 (#270)

Bumps [Microsoft.Extensions.Hosting](https://github.com/aspnet/Extensions) from 3.1.7 to 3.1.9.
- [Release notes](https://github.com/aspnet/Extensions/releases)
- [Commits](dotnet/extensions@v3.1.7...v3.1.9)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

src/FasTnT.Subscriptions/FasTnT.Subscriptions.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="MediatR" Version="9.0.0" />
     <PackageReference Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="3.1.9" />
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.1.7" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.1.9" />
     <PackageReference Include="morelinq" Version="3.3.2" />
   </ItemGroup>