Fix compile error with Pomelo.EntityFrameworkCore.MySql v5.0.0 (jhipster#728)

* Fix compile error with with MySql provider
Fix jhipster#727

* Bump mysql version

Author: ivanmonteiro

generators/server/templates/dotnetcore/src/Directory.Build.targets

@@ -85,7 +85,7 @@
 		<%_ break;
 		case 'mysql': _%>
 	<PackageReference Update="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="$(EntityFrameworkPackageVersion)" />
-	<PackageReference Update="Pomelo.EntityFrameworkCore.MySql" Version="5.0.0-alpha.1" />
+	<PackageReference Update="Pomelo.EntityFrameworkCore.MySql" Version="5.0.0" />
 	<PackageReference Update="Microsoft.EntityFrameworkCore.Tools" Version="$(EntityFrameworkPackageVersion)" />
 		<%_ break;
 		case 'oracle': _%>

generators/server/templates/dotnetcore/src/Project/Configuration/DatabaseStartup.cs.ejs

@@ -87,9 +87,8 @@ namespace <%= namespace %>.Configuration
                 <%_ break;
                 case 'mysql': _%>
             services.AddDbContext<ApplicationDatabaseContext>(options =>
-                options.UseMySql(connectionString, mySqlOptions =>
-                    mySqlOptions.ServerVersion(new ServerVersion(new Version(8, 0, 19), ServerType.MySql))
-            ));
+                options.UseMySql(connectionString, new MySqlServerVersion(new Version(8, 0, 19)))
+            );
                 <%_ break;
                 case 'oracle': _%>
             services.AddDbContext<ApplicationDatabaseContext>(options =>