Use a text format for PostgreSQL schema dump

[esistgut]

schema:dump command uses a custom binary format on PostgreSQL (-Fc parameter).
This was introduced with #34293 but after this too was merged #34711 bringing back support for restoring SQL files using psql.
If Laravel is currently able to restore SQL files on PostgreSQL just fine maybe defaulting to a text format would provide consistency with MySQL and a better experience for people editing/versioning these files.