Bump blockly from 7.20211209.2 to 10.3.0 in /csunplugged #1206

Job	Run time
Tests - Django system check	1m 46s
Tests - Documentation	32s
Tests - General	2m 55s
Tests - Content	4m 23s
Tests - Resources	2m 35s
Tests - Style	2m 2s
Tests - Management	3m 30s
Create at a distance files	0s
Create static files	0s
Create resources	0s
Create resource thumbnails	0s
Create and publish Docker image	0s
	17m 43s

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