[3.10] gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146...

[3.10] gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146) (#142213)

* gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146)

* Remove quadratic behavior in node ID cache clearing

Co-authored-by: Jacob Walls <38668450+jacobtylerwalls@users.noreply.github.com>
* Add news fragment

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(cherry picked from commit 08d8e18ad81cd45bc4a27d6da478b51ea49486e4)

Co-authored-by: Seth Michael Larson <seth@python.org>
Co-authored-by: Jacob Walls <38668450+jacobtylerwalls@users.noreply.github.com>
* [3.14] gh-142754: Ensure that Element & Attr instances have the ownerDocument attribute (GH-142794) (#142818)

gh-142754: Ensure that Element & Attr instances have the ownerDocument attribute (GH-142794)
(cherry picked from commit 1cc7551b3f9f71efbc88d96dce90f82de98b2454)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
* gh-142145: relax the no-longer-quadratic test timing (GH-143030)

* gh-142145: relax the no-longer-quadratic test timing

* require cpu resource
(cherry picked from commit 8d2d7bb2e754f8649a68ce4116271a4932f76907)

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
* merge NEWS entries into one

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Co-authored-by: Seth Michael Larson <seth@python.org>
Co-authored-by: Jacob Walls <38668450+jacobtylerwalls@users.noreply.github.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>