extensions/json-language-features/client/src/node/schemaCache.ts/JSONSchemaCache/getSchemaIfUpdatedSince
class JSONSchemaCache:	async getSchemaIfUpdatedSince(schemaUri: string, expirationDurationInHours: number): Promise<string | undefined> {
		const lastUpdatedInHours = this.getLastUpdatedInHours(schemaUri);
		if (lastUpdatedInHours !== undefined && (lastUpdatedInHours < expirationDurationInHours)) {
			return this.loadSchemaFile(schemaUri, this.cacheInfo[schemaUri], false);
		}
		return undefined;
	}