Increase the maximum heap size on Jenkins
Increase the maximum heap size on Jenkins

We're getting a lot of OutOfMemoryException when the maximum size is 1
GB, but we cannot increase it too much without using up all the memory
available on the Jenkins instances, let's see if 1.1 GB is enough.

Also stop using a custom -Xss, the default of 1 MB should be good enough.

densh/dotty,som-snytt/dotty,som-snytt/dotty,dotty-staging/dotty,lampepfl/dotty,lampepfl/dotty,sjrd/dotty,densh/dotty,som-snytt/dotty,sjrd/dotty,dotty-staging/dotty,som-snytt/dotty,dotty-staging/dotty,lampepfl/dotty,dotty-staging/dotty,lampepfl/dotty,sjrd/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,sjrd/dotty,som-snytt/dotty