[3.12] gh-109538: Catch closed loop runtime error and issue warning (GH-111983) ...

[3.12] gh-109538: Catch closed loop runtime error and issue warning (GH-111983) (#112142)

* [3.12] gh-109538: Avoid RuntimeError when StreamWriter is deleted with closed loop (GH-111983)

Issue a ResourceWarning instead.

(cherry picked from commit e0f512797596282bff63260f8102592aad37cdf1)
gh-109538: Avoid RuntimeError when StreamWriter is deleted with closed loop (#111983)

Issue a ResourceWarning instead.

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
(cherry picked from commit e0f512797596282bff63260f8102592aad37cdf1)

* Fix missing warnings import