Add Java 11 to Pulsar Build image and upgrade dependencies (#9609)
Add Java 11 to Pulsar Build image and upgrade dependencies (#9609)

* Add Java 11 to Pulsar Build image
- add Java 11
- set Default Maven version to 3.6.3
- use Python3/Pip3
- upgrade Go to 1.13

* clean up

Co-authored-by: Enrico Olivelli <07e410ee8dc2e6e114c721434b1411e048f4444b@apache.org>
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