v0.61.1

Patch

• PostgreSQL: COMMENT ON FUNCTION/PROCEDURE/AGGREGATE accepts argmode/argname/VARIADIC (#28) — parse_comment now uses parse_function_arg for the argument list, so IN/OUT/INOUT/VARIADIC modes and named args before the type parse correctly. 0.61.0 used bare parse_data_type and silently parse-failed any of these forms despite them being valid PG. Modes/names are intentionally discarded since Statement::Comment.arguments carries plain Vec<DataType> for identity matching.

This unblocks downstream COMMENT-ON regex-to-AST migrations.