fix: Add SF3 to mimeMap [skip ci]

Author: Danielku15

web.config

@@ -9,6 +9,7 @@
         <mimeMap fileExtension=".gp" mimeType="application/gp7" />
         <mimeMap fileExtension=".exe2" mimeType="application/mono" />
         <mimeMap fileExtension=".sf2" mimeType="application/soundfont2" />
+        <mimeMap fileExtension=".sf3" mimeType="application/soundfont2" />
 	</staticContent>
     <httpErrors errorMode="Detailed" existingResponse="Auto" />
     <rewrite>