Remove redundant DB_MIN_CONN_SIZE

In stac-fastapi-pgstac v5.0.2, DB_MIN_CONN_SIZE already defaults to 1. See stac-utils/stac-fastapi-pgstac@34d0fad for reference.

Author: sunu

helm-chart/eoapi/values.yaml

@@ -346,7 +346,6 @@ stac:
       PORT: "8080"
       # https://www.uvicorn.org/settings/#production
       WEB_CONCURRENCY: "5"
-      DB_MIN_CONN_SIZE: "1"
 
 vector:
   enabled: true