* upgrade okhttp-gson and google-api-client to junit5
* add changes in StringUtilTest
* use https instead of http to fix 301 (moved) error
* revert petstore test server url to http://petstore.swagger.io and regenerate samples
* synced gradle/sbt/pom, re-generated samples
* revert removal of port 80 from test url
* udpate google api client tests
* update sha
* update comment
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Co-authored-by: Thorsten Hirsch <t.hirsch@web.de>