Update browser-ui/server.py

Co-authored-by: Brett Cannon <brett@python.org>

Author: pmp-p

browser-ui/server.py

@@ -4,7 +4,7 @@
 
 mimetypes.init()
 if ".wasm" not in mimetypes.types_map:
- mimetypes.types_map[".wasm"] = "application/wasm"
+ mimetypes.add_type("application/wasm", ".wasm")
 
 import argparse
 from http import server