MAINT: explicitly install pygobject again with pip requirements #650

Job	Run time
Build	27s
build-on-ubuntu / build	3m 9s
build-installer-on-windows / build	4m 56s
build-on-windows / build	4m 33s
build-on-macos / build	2m 8s
Publish to TestPyPI	15s
Publish to PyPI	0s
Make github release	0s
	15m 28s

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