Backport changes from 4.x and 3.x to avoid memory leaks #4654
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Summary
Backport changes from 3.x and 4.x. to 2.13.x.
The main idea to copy the changes down to this version is that the official package for the ORM part does not support 3.x yet.
So this fixes the memory leak in the DBAL part.
I'm not very familiar with the codebase, so if there is something more that have to be done - please, let me know.