Fix issue #219: Add support for OBJECT_PUBLICATION in AlterOwnerStmt

[pyramation]

Fix #219: Add OBJECT_PUBLICATION support to AlterOwnerStmt deparser

Summary

Adds support for deparsing ALTER PUBLICATION ... OWNER TO ... statements by adding the OBJECT_PUBLICATION case to the AlterOwnerStmt switch statement in the deparser.

Changes:

• Added OBJECT_PUBLICATION case in packages/deparser/src/deparser.ts (3 lines)
• Fixture test for issue Error deparsing AlterOwnerStmt: Unsupported AlterOwnerStmt objectType: OBJECT_PUBLICATION #219 was already added in the base branch fix/issues-219

Before: Deparser threw error: Unsupported AlterOwnerStmt objectType: OBJECT_PUBLICATION
After: Successfully deparses to: ALTER PUBLICATION "my_publication" OWNER TO "postgres"

Review & Testing Checklist for Human

• Verify the fixture test misc/issues-17.sql passes and correctly round-trips the SQL statement
• Confirm CI checks pass (especially deparser test suite - all 284 tests should pass)
• Spot-check that the change follows the same pattern as other object types (e.g., OBJECT_COLLATION, OBJECT_TYPE)

Notes

• This is a minimal, surgical fix that adds 3 lines following the exact same pattern as all other object types in the switch statement
• All 284 deparser tests pass locally
• No new lint issues introduced by this change
• Built on top of the fix/issues-219 branch which already included the fixture test

Link to Devin run: https://app.devin.ai/sessions/505114984e764debaca3c75b2dab458c
Requested by: Dan Lynch (pyramation@gmail.com) / @pyramation

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