Incorrect version of Grpc is being used (package version ignored)

I am using the NuGet package `Google.Cloud.Firestore` which relies on some other packages where type forwarding is used. The forwarded types are not found and result in a `MissingMethodException`.

The issue occurs when debugging locally in VS Code on macOS. I haven't deployed this yet.

The same code works in a .NET Core console app.

A lot more details at the original issue: https://github.com/googleapis/google-cloud-dotnet/issues/3101

#### Investigative information

- Timestamp: Monday June 3th
- Function App version: 2.0

#### Repro steps

See original issue above

#### Expected behavior

Type forwarding is working and no `MissingMethodException`

#### Actual behavior

`MissingMethodException` when this calls into a forwarded type.

#### Known workarounds

?

#### Related information

* Programming language used: C#
* Links to source: email me for this (sam@debruyn.dev)
* Bindings used: QueueTrigger

Csproj:
```

netcoreapp2.2
v2
myappname









PreserveNewest


PreserveNewest


PreserveNewest
Never

```