chore(deps): update actions/github-script action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/github-script	action	major	v4 -> v6

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[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 56.7%, saving 306.42 KB.

Filename	Before	After	Improvement	Visual comparison
template/public/img/uploads/banner2.webp	213.91 KB	36.67 KB	-82.9%	View diff
template/public/img/uploads/exercises-with-waswere_56674_1.jpg	69.07 KB	65.94 KB	-4.5%	View diff
template/public/img/uploads/picture1.jpg	11.39 KB	7.10 KB	-37.6%	View diff
template/public/img/uploads/rect89.webp	89.89 KB	8.73 KB	-90.3%	View diff
template/public/img/uploads/untitled-diagram.jpg	56.61 KB	44.40 KB	-21.6%	View diff
template/public/img/uploads/whatsapp-image-2021-04-26-at-20.02.23.jpeg	99.70 KB	71.30 KB	-28.5%	View diff

20 images did not require optimisation.

[renovate]

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