By Foo Yun Chee BRUSSELS (Reuters) – EU antitrust regulators are likely to intensify information gathering on Gazprom’s European businesses, said a person familiar with the regulator’s thinking, amid Europe’s gas supply crisis. Last month EU antitrust chief Margrethe Vestager said she had asked gas companies including Gazprom about tight supplies after accusations the Russian giant was withholding extra production that could be released to lower soaring prices. Gazprom denies such allegations. The EU competition enforcer has yet to make a final decision on the next stage of the investigation, …