python-websockets: bump to 16.0, add test.sh

Major version bump from 11.0.3 to 16.0. The legacy API
(websockets.legacy.*) was removed in 14.0; the current public
API (connect/serve in websockets.asyncio.*) is stable and
backward-compatible since 12.0. Add test.sh that verifies core
imports (frames, http11, datastructures).

Changelog: https://websockets.readthedocs.io/en/stable/changelog.html
Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-websockets/test.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+[ "$1" = python3-websockets ] || exit 0
+
+python3 - << 'EOF'
+import websockets
+from websockets.version import version
+assert version, "websockets version is empty"
+
+from websockets.frames import Frame, Opcode
+from websockets.http11 import Request, Response
+from websockets.datastructures import Headers
+
+h = Headers([("Content-Type", "text/plain")])
+assert h["Content-Type"] == "text/plain", "Headers lookup failed"
+EOF