Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -339,7 +339,7 @@ jobs:
             brew install coreutils
             export PATH="$HOMEBREW_PREFIX/opt/coreutils/libexec/gnubin:$PATH"
           fi 
-          timeout 1500 jupyter lite serve --settings-overrides=overrides.json --XeusAddon.prefix=${{ env.PREFIX }} \
+          timeout 1400 jupyter lite serve --settings-overrides=overrides.json --XeusAddon.prefix=${{ env.PREFIX }} \
                          --XeusAddon.mounts="${{ env.PREFIX }}/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
                          --XeusAddon.mounts="${{ env.PREFIX }}/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
                          --contents README.md \