Unpin pyqtgraph and bump qcodes >=0.37.0

Edgar Reehuisrequested to merge
unpin-pyqtgraph into main

QCoDeS 0.37.0 replaces use of deprecated pyqtgraph functionality

By changing min required version to >= 0.37.0, we can remove the pin on pyqtgraph

See https://github.com/QCoDeS/Qcodes/pull/4886

Edited by Edgar Reehuis

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