fix deprecated use of std::u16 module

integer primitive type modules are deprecated, use
associated constants instead

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-http/src/websocket/mod.rs

@@ -206,7 +206,7 @@ pub fn create_frame(
 
     if len < 126 {
         buf.push(mask_bit | (len as u8));
-    } else if len < std::u16::MAX as usize {
+    } else if len < u16::MAX as usize {
         buf.push(mask_bit | 126);
         buf.extend_from_slice(&(len as u16).to_be_bytes());
     } else {