Merge pull request #957 from DuendeSoftware/mb/fix

Update IdentityServer upgrade docs to note EF Core dependency changes for .NET 8+

Author: maartenba

src/content/docs/identityserver/upgrades/v7_3-to-v7_4.md

@@ -27,6 +27,9 @@ There are no schema changes needed for IdentityServer 7.4. Small code changes ma
 - Removed public unused class `Duende.IdentityServer.Models.DiscoveryDocument`
 - Marked static properties referring to counters in `Telemetry.cs` as `readonly`
 
+Note that `Duende.IdentityServer.EntityFramework.Storage` now depends on Entity Framework Core 9.x in the `net8.0`
+target framework, which should be fully supported on both .NET 8 and .NET 9. .NET 10 projects will use Entity Framework Core 10.x.
+
 ## Step 1: Update NuGet package
 
 In your IdentityServer host project, update the version of the NuGet.