Pin PyO3 version in river (#62)

Author: ryanking13

packages/river/meta.yaml

@@ -6,6 +6,10 @@ package:
 source:
   url: https://files.pythonhosted.org/packages/31/23/4e4d1c99e38767c0afb4d6bcbe9a36157bf365578320d1b3356054e1fc79/river-0.22.0.tar.gz
   sha256: 8b06840e0d832dbd1064145e56e3f75492402716f5eb733753da3099194a3a68
+build:
+  script: |
+    # https://github.com/pyodide/pyodide/issues/5321
+    cargo update -p pyo3 --precise 0.23.1
 requirements:
   executable:
     - rustup