Pin the emsdk for now (#5077)

See emscripten-core/emscripten#17851

Author: kripken

.github/workflows/ci.yml

@@ -270,8 +270,10 @@ jobs:
         mkdir $HOME/emsdk
         git clone --depth 1 https://github.com/emscripten-core/emsdk.git $HOME/emsdk
         $HOME/emsdk/emsdk update-tags
-        $HOME/emsdk/emsdk install tot
-        $HOME/emsdk/emsdk activate tot
+        # pinned due to https://github.com/emscripten-core/emscripten/pull/17851
+        # TODO: go back to tot
+        $HOME/emsdk/emsdk install latest
+        $HOME/emsdk/emsdk activate latest
     - name: update path
       run:  echo "PATH=$PATH:$HOME/emsdk" >> $GITHUB_ENV
     - name: emcc-tests