Old fallback url referenced for sigma_schema_url in validation tests

[scripton8]

sigma/tests/validate-sigma-schema/validate.py

Lines 42 to 45 in 8e1b781

	sigma_schema_url = os.environ.get(
	"SIGMA_SCHEMA_URL",
	"https://raw.githubusercontent.com/SigmaHQ/sigma-specification/main/sigma-schema.json",
	)

The referenced file seemd to be removed from the referenced repo with the v.2.0.0 release. I am not sure if one of the current schema files match the one referenced (maybe this one), but all in all this does not seem to be up-to-date anymore. Also I am not sure if the sigma-schema.json file in this repo is maintained 100%, it seems that it gets copied from the sigma-specification repo here, maybe there are nicer solutions to include it like passing the url with version tag in the workflow.

[github-actions]

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