Update installing cdk cli

Author: Michael Kaiser

scripts/build-typescript.sh

@@ -20,7 +20,7 @@ fi
 # Check if yarn.lock exists
 if [ -f "yarn.lock" ]; then
     echo "yarn.lock file found. Running 'yarn install'..."
-    yarn install --frozen-lockfile
+    yarn install --frozen-lockfile --mutex network
     yarn build
     npm run --if-present test
 # Check if package-lock.json exists

scripts/synth.sh

@@ -12,7 +12,7 @@ if $fake_context; then
   cp $scriptdir/fake.context.json cdk.context.json
 fi
 
-yarn global add cdk@latest
+# yarn global add cdk@latest # > Should not need anymore.
 cdk synth
 
 if $fake_context; then