composer.json schema validation fails; URL incorrect

[aeschli]

Forwarded from microsoft/vscode#126699

Issue Type: Bug

When creating a new composer.json file, the JSON extension fails to validate with the following message:
{
"resource": "/Users/pedro/Projects/sql-updates/composer.json",
"owner": "generated_diagnostic_collection_name#0",
"code": "768",
"severity": 4,
"message": "Problems loading reference 'http://json.schemastore.org/composer': Unable to load schema from 'http://json.schemastore.org/composer': Request vscode/content failed unexpectedly without providing any details.",
"startLineNumber": 1,
"startColumn": 1,
"endLineNumber": 1,
"endColumn": 2
}
Navigating to that URL directly shows the following error:
"The resource you are looking for has been removed, had its name changed, or is temporarily unavailable."

The schema validates correctly per "composer validate" command.

[mglaman]

@ikappas will there be a release for the URL fix?