Merged PR 8040: [internal/release/3.1] Update dependencies from dnceng/internal/dotnet-efcore

This pull request updates the following dependencies

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## From https://github.com/dotnet/efcore
- **Subscription**: e908e90a-0c22-4c54-b254-08d79557a113
- **Build**: 20200520.1
- **Date Produced**: 5/20/2020 5:36 PM
- **Commit**: 85b57af827aa71b77d673e813e046d081c8027ed
- **Branch**: refs/heads/internal/release/3.1
- **Updates**:
  - **Microsoft.EntityFrameworkCore.Tools**: from 3.1.4 to 3.1.5
  - **Microsoft.EntityFrameworkCore.InMemory**: from 3.1.4 to 3.1.5
  - **Microsoft.EntityFrameworkCore**: from 3.1.4 to 3.1.5
  - **Microsoft.EntityFrameworkCore.Relational**: from 3.1.4 to 3.1.5
  - **Microsoft.EntityFrameworkCore.Sqlite**: from 3.1.4 to 3.1.5
  - **dotnet-ef**: from 3.1.4 to 3.1.5
  - **Microsoft.EntityFrameworkCore.SqlServer**: from 3.1.4 to 3.1.5

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Author: dotnet-bot

NuGet.config

@@ -4,9 +4,10 @@
     <clear />
     <!--Begin: Package sources managed by Dependency Flow automation. Do not edit the sources below.-->
     <add key="darc-pub-dotnet-corefx-8a3ffed" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-corefx-8a3ffed5/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-extensions-3b1f2b7" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-extensions-3b1f2b7c/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-efcore-0e7e329" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-efcore-0e7e329a/nuget/v3/index.json" />
-    <add key="darc-int-dotnet-core-setup-0c2e69c" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-core-setup-0c2e69ca/nuget/v3/index.json" />
+    <add key="darc-int-dotnet-extensions-877455f" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-extensions-877455ff/nuget/v3/index.json" />
+    <add key="darc-int-dotnet-efcore-5f01ecc" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-efcore-5f01ecc8/nuget/v3/index.json" />
+    <add key="darc-int-dotnet-core-setup-65cd789" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-core-setup-65cd7897/nuget/v3/index.json" />
+    <add key="darc-int-dotnet-corefx-620cea9" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-corefx-620cea9c/nuget/v3/index.json" />
     <add key="darc-int-dotnet-corefx-059a4a1" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-corefx-059a4a19/nuget/v3/index.json" />
     <add key="darc-int-dotnet-aspnetcore-tooling-0e01666" value="https://pkgs.dev.azure.com/dnceng/_packaging/darc-int-dotnet-aspnetcore-tooling-0e016665/nuget/v3/index.json" />
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->