[INFRA-588] Upgrade&Remove some inherited values

See
https://github.com/jenkinsci/pom/commit/4518f1577489d7a7fd91c0213ab708defb77a67f

effective-pom diff between & after this change:

    $ diff before.xml after.xml
    7c7
    <     <version>1.35</version>
    ---
    >     <version>1.36</version>
    85c85
    <       <url>http://maven.jenkins-ci.org:8081/content/repositories/releases</url>
    ---
    >       <url>https://repo.jenkins-ci.org/releases/</url>
    89c89
    <       <url>http://maven.jenkins-ci.org:8081/content/repositories/snapshots</url>
    ---
    >       <url>https://repo.jenkins-ci.org/snapshots/</url>