[3.14] gh-139640: Fix swallowing syntax warnings in different modules (GH-139755...

[3.14] gh-139640: Fix swallowing syntax warnings in different modules (GH-139755) (GH-140117)

Revert GH-131993.

Fix swallowing some syntax warnings in different modules if they accidentally
have the same message and are emitted from the same line.

Fix duplicated warnings in the "finally" block.

(cherry picked from commit 279db6bede30be3a1b86803585eb4404d27800da)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
* Update 2025-10-06-10-03-37.gh-issue-139640.gY5oTb.rst

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Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>