Update stale.yml to increase max random wait to 180''

In the Moq repo (one of the more popular ones in devlooped), stale runs take ~18'', so make the random wait larger to avoid multiple repos starting at the same time.

.github/workflows/stale.yml

@@ -33,7 +33,9 @@ jobs:
           GH_TOKEN: ${{ github.token }}        
         run: |
           # add random sleep since we run on fixed schedule
-          sleep (get-random -max 60)
+          $wait = get-random -max 180
+          echo "Waiting random $wait seconds to start"          
+          sleep $wait
           # get currently authenticated user rate limit info
           $rate = gh api rate_limit | convertfrom-json | select -expandproperty rate
           # if we don't have at least 100 requests left, wait until reset