Update dependency Microsoft.Identity.Client to 4.68.0

Author: renovate[bot]

src/Cake.AzureDevOps/Cake.AzureDevOps.csproj

@@ -38,7 +38,7 @@
     <PackageReference Include="Microsoft.VisualStudio.Services.InteractiveClient" Version="19.225.1" PrivateAssets="All" />
     <PackageReference Include="TfsUrlParser" Version="1.5.0" PrivateAssets="All" />
     <!--Transitive dependencies specified to fix security vulnerabilities-->
-    <PackageReference Include="Microsoft.Identity.Client" Version="4.66.2" />
+    <PackageReference Include="Microsoft.Identity.Client" Version="4.68.0" />
     <PackageReference Include="System.Data.SqlClient" Version="4.9.0" />
     <PackageReference Include="System.Formats.Asn1" Version="9.0.1" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.2.1" />