CI: Update GitHub actions

.github/workflows/emscripten.yml

@@ -2,7 +2,7 @@ name: Emscripten Build
 on: [push, pull_request]
 
 env:
-  EM_VERSION: 3.1.44
+  EM_VERSION: 3.1.54
   EM_CACHE_FOLDER: 'emsdk-cache'
 
 jobs:
@@ -10,19 +10,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true
 
     - name: Setup cache
       id: cache-system-libraries
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ${{env.EM_CACHE_FOLDER}}
         key: ${{env.EM_VERSION}}-${{ runner.os }}
 
     - name: Setup Emscripten toolchain
-      uses: mymindstorm/setup-emsdk@v12
+      uses: mymindstorm/setup-emsdk@v14
       with:
         version: ${{ env.EM_VERSION }}
         actions-cache-folder: ${{env.EM_CACHE_FOLDER}}
@@ -32,12 +32,12 @@ jobs:
         mkdir -p out/wasm
         cd out/wasm
         emcmake cmake -DCMAKE_BUILD_TYPE=Release ../../
-        make
+        make -j4
         mkdir system3
         mv system3.* system3/
 
     - name: Upload artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: system3-wasm
         path: out/wasm/system3