ci: Fix Travis CI pip deployment error

* refs https://travis-ci.community/t/cant-deploy-to-pypi-anymore-pkg-resources-contextualversionconflict-importlib-metadata-0-18/10494/9

Author: achimnol

.travis.yml

@@ -27,3 +27,6 @@ jobs:
         username: "__token__"
         password:
           secure: "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"
+        edge:
+          source: 'native-api/dpl'
+          branch: 'pip_fix_upgrade_deps'