Bump Alpaca.Markets.Extensions from 7.0.0-beta1 to 7.0.0-rc1 (#258)

Bumps [Alpaca.Markets.Extensions](https://github.com/alpacahq/alpaca-trade-api-csharp) from 7.0.0-beta1 to 7.0.0-rc1.
- [Release notes](https://github.com/alpacahq/alpaca-trade-api-csharp/releases)
- [Commits](alpacahq/alpaca-trade-api-csharp@ext-7.0.0-beta1...ext-7.0.0-rc1)

---
updated-dependencies:
- dependency-name: Alpaca.Markets.Extensions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Alpaca.Markets.Tests.All/Alpaca.Markets.Tests.All.csproj

@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Alpaca.Markets" Version="7.0.0-rc1" />
-    <PackageReference Include="Alpaca.Markets.Extensions" Version="7.0.0-beta1" />
+    <PackageReference Include="Alpaca.Markets.Extensions" Version="7.0.0-rc1" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="7.0.0" />

Alpaca.Markets.Tests.Win/Alpaca.Markets.Tests.Win.csproj

@@ -13,7 +13,7 @@
 
   <ItemGroup>
     <PackageReference Include="Alpaca.Markets" Version="7.0.0-rc1" />
-    <PackageReference Include="Alpaca.Markets.Extensions" Version="7.0.0-beta1" />
+    <PackageReference Include="Alpaca.Markets.Extensions" Version="7.0.0-rc1" />
     <PackageReference Include="IndexRange" Version="1.0.3" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="7.0.0" />