fixed invalid | None syntax for python 3.9

[jasparm]

Fixes issue #9992

Summary by CodeRabbit

• Chores
  • Internal code maintenance update with no user-facing changes.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 0d11dbc and 5b64818.

📒 Files selected for processing (1)

• web/pgadmin/llm/tools/database.py

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Walkthrough

The return type annotation of the internal _connect_readonly helper function is updated from the modern union syntax str | None to the equivalent Optional[str] notation. The function behavior is unchanged; only the type annotation style is modified for compatibility.

Changes

Type annotation compatibility

Layer / File(s)	Summary
Return type annotation compatibility web/pgadmin/llm/tools/database.py	The _connect_readonly function's return type is updated from `tuple[bool, str

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing Python 3.9 incompatibility by replacing the pipe union syntax (|) with Optional, which is the core purpose of the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[jasparm]

This fixes issue #9992