Consider QgsNetworkAccessManager instead of requests

[ujr]

Using QgsNetworkAccessManager instead of the popular Python requests or urllib packages is recommended practice. For details and reasoning see:

• https://plugins.qgis.org/publish/
• https://wheregroup.com/blog/details/netzwerkanfragen-in-pyqgis-richtig-programmieren/

Documentation of QgsNetworkAccessManager:

• https://qgis.org/pyqgis/master/core/QgsNetworkAccessManager.html

Study the details and, potentially, change the implementation to use QgsNetworkAccessManager.