Bump Alpaca.Markets and Portable.System.DateTimeOnly

Bumps [Alpaca.Markets](https://github.com/alpacahq/alpaca-trade-api-csharp) and [Portable.System.DateTimeOnly](https://github.com/OlegRa/System.DateTimeOnly). These dependencies needed to be updated together.

Updates `Alpaca.Markets` from 7.1.2 to 7.1.4
- [Release notes](https://github.com/alpacahq/alpaca-trade-api-csharp/releases)
- [Commits](alpacahq/alpaca-trade-api-csharp@sdk7.1.2...sdk7.1.4)

Updates `Portable.System.DateTimeOnly` from 8.0.2 to 8.0.2
- [Release notes](https://github.com/OlegRa/System.DateTimeOnly/releases)
- [Commits](OlegRa/System.DateTimeOnly@j8.0.2...j8.0.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

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

@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Alpaca.Markets" Version="7.1.2" />
+    <PackageReference Include="Alpaca.Markets" Version="7.1.4" />
     <PackageReference Include="Alpaca.Markets.Extensions" Version="7.1.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="9.0.0" />

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

@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Alpaca.Markets" Version="7.1.2" />
+    <PackageReference Include="Alpaca.Markets" Version="7.1.4" />
     <PackageReference Include="Alpaca.Markets.Extensions" Version="7.1.0" />
     <PackageReference Include="IndexRange" Version="1.0.3" />
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.0" />