fix PostgreSQL upsert SQL syntax error (#2166)

[ningmeng0503]

Fixes #2166.
Removed an extra comma in PostgresBaseStore.UPSERT_SQL that caused a PostgreSQL syntax error on the ON CONFLICT ... DO UPDATE branch.

[codecov]

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[AgentScopeJavaBot]

🤖 AI Review

This PR fixes a clear PostgreSQL syntax error in PostgresBaseStore.UPSERT_SQL where an extra comma (,,) appeared at the end of the version assignment inside the ON CONFLICT DO UPDATE SET clause. The double comma would cause every put() call to fail with a SQL parse error at runtime, making the upsert path completely non-functional. The fix is a minimal one-character removal that is correct and complete. No secondary issues or missing test coverage concerns rise to the level of a finding given the triviality and precision of the change.

[AgentScopeJavaBot]

🤖 AI Review

This PR fixes a clear PostgreSQL syntax error in PostgresBaseStore.UPSERT_SQL where an extra comma (,,) appeared at the end of the version assignment inside the ON CONFLICT DO UPDATE SET clause. The double comma would cause every put() call to fail with a SQL parse error at runtime, making the upsert path completely non-functional. The fix is a minimal one-character removal that is correct and complete. No secondary issues or missing test coverage concerns rise to the level of a finding given the triviality and precision of the change.