fix browser warnings related to crossorigin preload (#9984)

templates/base/head.tmpl

@@ -87,9 +87,9 @@
 	<link rel="mask-icon" href="{{StaticUrlPrefix}}/img/gitea-safari.svg" color="#609926">
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/assets/font-awesome/css/font-awesome.min.css">
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/assets/octicons/octicons.min.css">
-	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/fomantic/themes/default/assets/fonts/icons.woff2" type="font/woff2">
-	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/fomantic/themes/default/assets/fonts/outline-icons.woff2" type="font/woff2">
-	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/vendor/assets/octicons/octicons.woff2?ef21c39f0ca9b1b5116e5eb7ac5eabe6" type="font/woff2">
+	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/fomantic/themes/default/assets/fonts/icons.woff2" type="font/woff2" crossorigin="anonymous">
+	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/fomantic/themes/default/assets/fonts/outline-icons.woff2" type="font/woff2" crossorigin="anonymous">
+	<link rel="preload" as="font" href="{{StaticUrlPrefix}}/vendor/assets/octicons/octicons.woff2?ef21c39f0ca9b1b5116e5eb7ac5eabe6" type="font/woff2" crossorigin="anonymous">
 {{if .RequireSimpleMDE}}
 	<link rel="stylesheet" href="{{StaticUrlPrefix}}/vendor/plugins/simplemde/simplemde.min.css">
 {{end}}