CI: upgrade emscripten to v3.1.61

Author: EzraH442

.github/workflows/emscripten.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   emscripten:
     env:
-      EMSCRIPTEN_VERSION: 3.1.47
+      EMSCRIPTEN_VERSION: 3.1.61
     runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v4