Fix nuget push

Author: JimBobSquarePants

.github/workflows/build-and-test.yml

@@ -144,6 +144,6 @@ jobs:
             - name: MyGet Publish
               shell: pwsh
               run: |
-                  nuget.exe push .\artifacts\*.nupkg ${{secrets.MYGET_TOKEN}} -Source https://www.myget.org/F/sixlabors/api/v2/package
-                  nuget.exe push .\artifacts\*.snupkg ${{secrets.MYGET_TOKEN}} -Source https://www.myget.org/F/sixlabors/api/v3/index.json
+                  dotnet nuget push .\artifacts\*.nupkg ${{secrets.MYGET_TOKEN}} -Source https://www.myget.org/F/sixlabors/api/v2/package
+                  dotnet nuget push .\artifacts\*.snupkg ${{secrets.MYGET_TOKEN}} -Source https://www.myget.org/F/sixlabors/api/v3/index.json
               # TODO: If github.ref starts with 'refs/tags' then it was tag push and we can optionally push out package to nuget.org