Found this when trying to upgrade the http client in the auth library.

Caused by #529. If the token looks like an integer we now try to parse it as an integer. This number can overflow an integer and make the parser blow up. Additionally, it changed the expected return type which breaks many internal customers.

googleapis/google-auth-library-java#249

TODO:

• revert Fix int type transformed as BigDecimal value when parsing as Map #529 in Revert #529 #662
• add tests in Add abstract JSON test and tests for Jackson2 and gson #665
• backport to a 1.29 branch and release 1.29.2