bump duckdb_fdw version to v1.1.2

[Vonng]

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https://github.com/duckdb/duckdb/releases/tag/v1.1.0

[ahuarte47]

A PR is already proposed.

[ahuarte47]

FYI; this other MR (unfortunately not merged yet) removes the dependency of a specific versions of duckdb headers. You can build duckdb_fdw using the release of duckdb of your choice. You download the desired release and build it using their headers and lib.

[alitrack]

thanks, and merged