chore(scripts): increase check-url.sh RETRY value

Because:

* Mac M1 and M2 machines are slower to start up infrastructure like Redis and Firestore (which runs under emulation).

This commit:

* Doubles the RETRY period from 120 to 240s as most of the time, the __heartbeat__ response for fxa-auth-server and firestore processes responded between 140 - 190s.

Closes #No ticket

_scripts/check-url.sh

@@ -3,7 +3,7 @@
 echo "Checking for response from: $1"
 
 
-RETRY=120
+RETRY=240
 for i in $(eval echo "{1..$RETRY}"); do
   if [ "$(curl -s -o /dev/null --silent -w "%{http_code}"  http://$1)" == "${2:-200}" ]; then
     echo "$1 responded in $SECONDS seconds"