Try to update emsdk version

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

ci/emscripten.sh

@@ -2,28 +2,11 @@
 
 set -ex
 
-EMSDK_VERSION=1.39.20
-
-hide_output() {
-  set +x
-  on_err="
-echo ERROR: An error was encountered with the build.
-cat /tmp/build.log
-exit 1
-"
-  trap '$on_err' ERR
-  bash -c "while true; do sleep 30; echo \$(date) - building ...; done" &
-  PING_LOOP_PID=$!
-  "${@}" &> /tmp/build.log
-  trap - ERR
-  kill $PING_LOOP_PID
-  rm -f /tmp/build.log
-  set -x
-}
+EMSDK_VERSION=3.1.23
 
 git clone https://github.com/emscripten-core/emsdk.git /emsdk-portable
 cd /emsdk-portable
-hide_output ./emsdk install "${EMSDK_VERSION}"
+./emsdk install "${EMSDK_VERSION}"
 ./emsdk activate "${EMSDK_VERSION}"
 
 # Compile and cache libc