chore: Remove CA bundle env variable for certbot (#30879)

We don't use certbot anymore, so this isn't needed anymore.

deploy/docker/fs/opt/appsmith/entrypoint.sh

@@ -327,9 +327,6 @@ setup-custom-ca-certificates() (
     echo "-Djavax.net.ssl.trustStore=$store"
     echo "-Djavax.net.ssl.trustStorePassword=changeit"
   } > "$opts_file"
-
-  # Get certbot to use the combined trusted CA certs file.
-  export REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
 )
 
 configure_supervisord() {