Merged PR 13922: Fix null ref warning

+semver: patch

Author: Kristóf Stedra

src/AutSoft.DbScaffolding/CodeTemplates/CSharpDbContext/Partials/DbSets.hbs

@@ -1,3 +1,3 @@
 {{#each dbsets}}
-        public virtual DbSet<{{set-property-type}}> {{set-property-name}} { get; set; }{{#if nullable-reference-types }} = null!;{{/if}}
-{{/each}}
+        public virtual DbSet<{{set-property-type}}> {{set-property-name}} {{#if nullable-reference-types }}=> Set<{{set-property-type}}>();{{else}}{ get; set; }{{/if}}
+{{/each}}