ci: cache emscripten in wasm build

Author: ntamas

.github/workflows/build.yml

@@ -179,15 +179,16 @@ jobs:
       - uses: actions/setup-python@v4
         name: Install Python
         with:
-          python-version: '3.10.2'
+          python-version: '3.11.2'
 
       - uses: mymindstorm/setup-emsdk@v12
         with:
-          version: '3.1.14'
+          version: '3.1.32'
+          actions-cache-folder: 'emsdk-cache'
 
       - name: Build wheel
         run: |
-          pip install pyodide-build==0.21.0
+          pip install pyodide-build==0.23.4
           pyodide build
 
       - uses: actions/upload-artifact@v3