Increase Develocity access token expiry to 4 hours

[wilkinsona]

For reasons currently unknown, CI builds sometimes take a very long time to complete. When they take in excess of two hours, the short-lived access token that's used to authenticate with ge.spring.io expires before the build scan's published and the publishing attempt fails. We should increase the expiry time so that the build scan can be published and hopefully help us to figure out why the build took so long.