Fix the ProcessFormPostResponse handler to return Cache-Control: no-store instead of no-cache

src/OpenIddict.Server.AspNetCore/OpenIddictServerAspNetCoreHandlers.Authentication.cs

@@ -208,7 +208,7 @@ public static partial class OpenIddictServerAspNetCoreHandlers
                 response.ContentLength = buffer.Length;
                 response.ContentType = "text/html;charset=UTF-8";
 
-                response.Headers[HeaderNames.CacheControl] = "no-cache";
+                response.Headers[HeaderNames.CacheControl] = "no-store";
                 response.Headers[HeaderNames.Pragma] = "no-cache";
                 response.Headers[HeaderNames.Expires] = "-1";
 

src/OpenIddict.Server.Owin/OpenIddictServerOwinHandlers.Authentication.cs

@@ -200,7 +200,7 @@ public static partial class OpenIddictServerOwinHandlers
                 response.ContentLength = buffer.Length;
                 response.ContentType = "text/html;charset=UTF-8";
 
-                response.Headers[Headers.CacheControl] = "no-cache";
+                response.Headers[Headers.CacheControl] = "no-store";
                 response.Headers[Headers.Pragma] = "no-cache";
                 response.Headers[Headers.Expires] = "-1";