fix(pg-connection-string): export default from esm wrapper

Prior to v2.8.0, the parse function was the default when using import.
When esm compatibility was introduced in v2.8.0, there was not default
specified. This broke existing code that relied on that default.

Fixes #3424

Author: hjr3

packages/pg-connection-string/esm/index.mjs

@@ -2,6 +2,7 @@
 import connectionString from '../index.js'
 
 // Re-export the parse function
+export default connectionString.parse
 export const parse = connectionString.parse
 export const toClientConfig = connectionString.toClientConfig
 export const parseIntoClientConfig = connectionString.parseIntoClientConfig