chore(deps): update dependency duende.identityserver to v8

Author: github-actions[bot]

src/Workleap.Authentication.ClientCredentialsGrant.Tests/Workleap.Authentication.ClientCredentialsGrant.Tests.csproj

@@ -15,7 +15,7 @@
 
   <ItemGroup>
     <PackageReference Include="CliWrap" Version="3.10.2" />
-    <PackageReference Include="Duende.IdentityServer" Version="7.4.7" />
+    <PackageReference Include="Duende.IdentityServer" Version="8.0.0" />
     <PackageReference Include="FakeItEasy" Version="9.0.1" />
     <PackageReference Include="Meziantou.Framework.FullPath" Version="1.1.21" />
     <PackageReference Include="Microsoft.AspNetCore.TestHost" Version="8.0.7" />