Fix powershell installation

[nvuillam]

Use official powershell installation instructions

https://learn.microsoft.com/en-us/powershell/scripting/install/install-alpine?view=powershell-7.4

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
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✅ BASH	shellcheck	5		0	0.17s
✅ BASH	shfmt	5	0	0	0.07s
✅ COPYPASTE	jscpd	yes		no	4.12s
✅ DOCKERFILE	hadolint	124		0	14.84s
✅ JSON	eslint-plugin-jsonc	23	0	0	3.39s
✅ JSON	jsonlint	21		0	0.31s
✅ JSON	v8r	23		0	18.87s
✅ MAKEFILE	checkmake	1		0	0.03s
⚠️ MARKDOWN	markdownlint	256	0	11	7.13s
✅ MARKDOWN	markdown-link-check	256		0	8.07s
✅ MARKDOWN	markdown-table-formatter	256	0	0	52.34s
✅ OPENAPI	spectral	1		0	1.91s
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✅ PYTHON	black	201	0	0	4.2s
✅ PYTHON	flake8	201		0	2.71s
✅ PYTHON	isort	201	0	0	0.71s
✅ PYTHON	mypy	201		0	14.89s
✅ PYTHON	pylint	201		0	16.73s
⚠️ PYTHON	pyright	201		342	24.91s
✅ PYTHON	ruff	201	0	0	0.14s
✅ REPOSITORY	checkov	yes		no	39.35s
✅ REPOSITORY	git_diff	yes		no	0.06s
⚠️ REPOSITORY	grype	yes		1	25.31s
✅ REPOSITORY	secretlint	yes		no	11.43s
✅ REPOSITORY	trivy	yes		no	40.11s
✅ REPOSITORY	trivy-sbom	yes		no	20.26s
⚠️ REPOSITORY	trufflehog	yes		1	17.94s
✅ SPELL	cspell	668		0	31.49s
✅ SPELL	lychee	336		0	5.22s
✅ XML	xmllint	3	0	0	0.06s
✅ YAML	prettier	160	0	0	7.64s
✅ YAML	v8r	102		0	154.33s
✅ YAML	yamllint	161		0	2.16s

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[bdovaz]

@nvuillam why did you change the installation mode? The previous one (using API) allowed us to automatically reference "latest", now it is not possible and we have to change it manually, i.e. now it is more expensive to keep powershell updated because it is spread over several different descriptors.

cc: @echoix @Kurt-von-Laven

[echoix]

I don't think it's that problematic, it's the official download instructions, we don't use up another api request (we are sometimes hitting some limits), and it's quite the standard way we download from github releases anyways. Since the version is pinned in the powershell descriptor, there's only one place anyway to change anyway, and at least the builds are kinda reproducible.

[nvuillam]

Usually when i do an update like that it's because Auto-update-linters job is failing with its current instructions , that probably was the case :)