Upgrade rds-cluster to Postgresql 13

[krisstanton]

Updated the engine version and parameter group family for rds-cluster for Postgresql13

Ticket Reference: #358

DB Changes in Sandbox have already been made, so the below steps should work.
To see what DB changes were made, see Ticket #358

Follow these steps to ensure your local sandbox works.

// Pull down the latest code
git checkout main
git fetch
git pull
git checkout iss358__cumulus_upgrade_18_2_0_DB_to_13
git pull

// Run a deployment to your sandbox
DOTENV=.env.sandbox make all-init 
DOTENV=.env.sandbox make all-up-yes

// Run the smoke test
DOTENV=.env.sandbox make bash
cumulus rules enable --name PSScene3Band___1_SmokeTest
cumulus rules run --name PSScene3Band___1_SmokeTest

After running the smoke test, please let me know so I can verify it!

[jsrikish]

Looks good.