Revert "Bump spring.version from 4.1.6.RELEASE to 5.1.9.RELEASE"
Revert "Bump spring.version from 4.1.6.RELEASE to 5.1.9.RELEASE"

This reverts commit df88756495ccf3796c17c7685b2df903a3b41649.

whiskeysierra/riptide,zalando/riptide,zalando/riptide,whiskeysierra/riptide