Use https instead of http (#4121)

Author: MarvinKlein1508

examples/Demo/Shared/Shared/DemoMainLayout.razor

@@ -37,7 +37,7 @@
 
             <div class="links">
                 <FluentAnchor Appearance="Appearance.Hypertext"
-                              Href="http://github.com/microsoft/fluentui-blazor" Target="_blank" Rel="noreferrer noopener"
+                              Href="https://github.com/microsoft/fluentui-blazor" Target="_blank" Rel="noreferrer noopener"
                               title="Fluent UI Blazor library source on GitHub" aria-label="Fluent UI Blazor library source on GitHub">
                     <FluentIcon Value="@(new DemoIcons.Size20.GitHub())" Color="Color.FillInverse" />
                 </FluentAnchor>