Use pyodide's fork of emsdk

Author: oscarbenjamin

.github/workflows/buildwheel.yml

@@ -97,7 +97,7 @@ jobs:
 
       - if: ${{ matrix.kind == 'pyodide' }}
         name: Set up Emscripten toolchain
-        uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
+        uses: pyodide/setup-emsdk@ca2dd8aef8c2a0e11743c5c36f0b430ddb694b5c # v15
         with:
           version: ${{ matrix.emscripten_version }}
           actions-cache-folder: emsdk-cache