Make django-leaflet compatible with CSP (#371) #110

Job	Run time
tests_node	14s
Test on Python 3.7 and Django 3.2 on postgres	1m 8s
Test on Python 3.8 and Django 3.2 on postgres	1m 15s
Test on Python 3.9 and Django 3.2 on postgres	1m 49s
Test on Python 3.10 and Django 3.2 on postgres	1m 2s
Test on Python 3.8 and Django 4.0 on postgres	1m 12s
Test on Python 3.9 and Django 4.0 on postgres	2m 5s
Test on Python 3.10 and Django 4.0 on postgres	1m 0s
Test on Python 3.8 and Django 4.1 on postgres	1m 2s
Test on Python 3.9 and Django 4.1 on postgres	1m 12s
Test on Python 3.10 and Django 4.1 on postgres	1m 13s
Test on Python 3.11 and Django 4.1 on postgres	1m 10s
Test on Python 3.8 and Django 4.2 on postgres	1m 34s
Test on Python 3.9 and Django 4.2 on postgres	1m 25s
Test on Python 3.10 and Django 4.2 on postgres	1m 13s
Test on Python 3.11 and Django 4.2 on postgres	1m 12s
Test on Python 3.7 and Django 3.2 on sqlite	1m 28s
	21m 14s

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