Merge branch 'fix/ws_transport_linux_signed_promotions' into 'master'

fix(ws_transport): Fix incorrect packet-len on linux due to int promotions of char (GitHub PR)

Closes IDFGH-13642 and IDFGH-13657

See merge request espressif/esp-idf!33595

components/tcp_transport/transport_ws.c

@@ -504,7 +504,7 @@ static int ws_read_header(esp_transport_handle_t t, char *buffer, int len, int t
             ESP_LOGE(TAG, "Error read data");
             return rlen;
         }
-        payload_len = data_ptr[0] << 8 | data_ptr[1];
+        payload_len = (uint8_t)data_ptr[0] << 8 | (uint8_t)data_ptr[1];
     } else if (payload_len == 127) {
         // headerLen += 8;
         header = 8;
@@ -517,7 +517,7 @@ static int ws_read_header(esp_transport_handle_t t, char *buffer, int len, int t
             // really too big!
             payload_len = 0xFFFFFFFF;
         } else {
-            payload_len = data_ptr[4] << 24 | data_ptr[5] << 16 | data_ptr[6] << 8 | data_ptr[7];
+            payload_len = (uint8_t)data_ptr[4] << 24 | (uint8_t)data_ptr[5] << 16 | (uint8_t)data_ptr[6] << 8 | data_ptr[7];
         }
     }