Docs: Update Version of Postgress DB

[danaelhe]

When running the example as is, you get a:

│ Error: Error creating database cluster: POST https://api.digitalocean.com/v2/databases: 422 (request "4f7f-a1a4-") invalid cluster engine version

changing the version to 13 worked fine.

[andrewsomething]

👍 Good catch!

Looks like 15 is the most recent. Maybe use that since it will presumably be around longer?

$ doctl databases options versions ls
Engine     Versions
mongodb    [4.4,5.0,6.0]
mysql      [8]
pg         [12,13,14,15]
redis      [7]

[danaelhe]

👍 Good catch!

Looks like 15 is the most recent. Maybe use that since it will presumably be around longer?

$ doctl databases options versions ls
Engine     Versions
mongodb    [4.4,5.0,6.0]
mysql      [8]
pg         [12,13,14,15]
redis      [7]

Good point- just updated 👍