Remove backend 3.7-deprecated API #26962 #27225
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PR summary
Removal of old and unused API that were marked as deprecated in 3.7 of Matplotlib
(issue #26865)
changes made :
Removed PsBackendHelper class and ServerThread class which were deprecated in 3.7 version of Matplotlib
Also removed PyBufferRegion_to_string and PyBufferRegion_to_string_argb methods from c++ files as they were also deprecated in 3.7 version of Matplotlib.
PR checklist