chore(csharp): Bump Azure.Identity from 1.17.1 to 1.19.0

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-version: 1.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

csharp/test/AdbcDrivers.BigQuery.Tests.csproj

@@ -4,7 +4,7 @@
     <TargetFrameworks Condition="'$(TargetFrameworks)'==''">net8.0</TargetFrameworks>
   </PropertyGroup>
     <ItemGroup>
-     <PackageReference Include="Azure.Identity" Version="1.17.1" />
+     <PackageReference Include="Azure.Identity" Version="1.19.0" />
      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
      <PackageReference Include="System.Net.Http.WinHttpHandler" Version="8.0.2" Condition="'$(TargetFrameworkIdentifier)' == '.NETStandard'" />
      <PackageReference Include="xunit" Version="2.9.3" />