Fix master

[wheelerlaw]

Summary

Maven now disables http repos by default. See more information in this StackOverflow question:

Maven now disables all insecure http://* mirrors by default. Here is explanation from maven mainteners: http://maven.apache.org/docs/3.8.1/release-notes.html#cve-2021-26291

More and more repositories use HTTPS nowadays, but this hasn’t always been the case. This means that Maven Central contains POMs with custom repositories that refer to a URL over HTTP. This makes downloads via such repository a target for a MITM attack. At the same time, developers are probably not aware that for some downloads an insecure URL is being used. Because uploaded POMs to Maven Central are immutable, a change for Maven was required. To solve this, we extended the mirror configuration with parameter, and we added a new external:http: mirror selector (like existing external:), meaning “any external URL using HTTP”. The decision was made to block such external HTTP repositories by default: this is done by providing a mirror in the conf/settings.xml blocking insecure HTTP external URLs.

This changes the Jenkins repo from http to https.

Checklist

Testing

(Remove this checklist and replace it with "N/A - no code changes" if this PR does not modify source code)

• [x] I have manually verified that my code changes do the right thing.
• [x] I have run the tests and verified that my changes do not introduce any regressions.
• [ ] I have written unit tests to verify that my code changes do the right thing and to protect my code against regressions

Documentation

(Remove this checklist and replace it with "N/A - no code changes" if this PR does not modify source code)

• [x] I have updated the "Unreleased" section of CHANGELOG.md with a brief description of my changes.
• [ ] I have updated code comments - both GroovyDoc/JavaDoc-style comments and inline comments - where appropriate.
• [x] I have read CONTRIBUTING.md and have followed its guidance.