Remove monomod dev build shims

This removes shims in-place to fetch monomod from outside of nuget,
since monomod has pushed the applicable versions to their primary nuget
repositories, and because the dev builds add unnecessary complexity to
the CI pipeline if kept in place.

.github/workflows/ci-otapi3.yml

@@ -15,9 +15,6 @@ jobs:
         with:
           dotnet-version: '6.0.100'
 
-      - name: MonoMod dev build
-        run: dotnet nuget add source https://pkgs.dev.azure.com/MonoMod/MonoMod/_packaging/DevBuilds%40Local/nuget/v3/index.json -n DevBuilds@Local
-
       - name: Run tests
         run: dotnet test
 
@@ -36,9 +33,6 @@ jobs:
         with:
           dotnet-version: '6.0.100'
 
-      - name: MonoMod dev build
-        run: dotnet nuget add source https://pkgs.dev.azure.com/MonoMod/MonoMod/_packaging/DevBuilds%40Local/nuget/v3/index.json -n DevBuilds@Local
-
       - name: Produce build
         run: |
             cd TShockLauncher