Turn off Buster Debian packaging builds

We are moving away from providing distro specific packaging and
towards using .tar.gz prebuilt packages.

This is a first step.

Author: SeanTAllen

.travis.yml

@@ -72,11 +72,3 @@ deploy:
     branch: release
   key:
     secure: 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
-- provider: bintray
-  user: pony-buildbot-2
-  file: /home/travis/build/ponylang/pony-stable/bintray_debian_buster.json
-  skip_cleanup: true
-  on:
-    branch: release
-  key:
-    secure: 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

.travis_script.bash

@@ -93,7 +93,6 @@ pony-stable-build-debs(){
 
   build_deb xenial
   build_deb bionic
-  build_deb buster
   build_deb stretch
 
   ls -la