Applying plugin modernization guidance, upgrading most dependencies versions

[aneveux]

Hello folks 👋

I was following the plugin modernization guide and noticed that this plugin could use some updates.

This PR proposes to:

• Update the Jenkinsfile to use JDK 11 and 17
• Update the plugin parent version
• Update the minimum Jenkins version
• Update the BOM that is used
• Update the dependencies versions
• Use Dependabot for managing dependencies versions
• Remove travis integration
• Increase the Spotbugs level and fix associated issues
• Replace JSR-305
• Update the README with previous changes

I tested this PR by building the plugin and running all of the tests.

Please feel free to let me know if anything else needs to be considered.

Please note that a last piece of modernization could be used: enabling incrementals. I did not do it in that PR but I am happy to provide another PR to enable it.

Testing done

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2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

[aneveux]

Hello @maxlaverse 👋

Hope you're doing great! I saw that you're the main contributor of this project, please let me know if that PR looks interesting to you or if some additional work would be required on it.

Also pinging @Vlatombe as I noticed some contributions from you as well.

[aneveux]

Sadly CI is failing because it is still trying to build with JDK8 which is not supported anymore with recent parent plugin versions.

[maxlaverse]

Thanks @aneveux !
I’m currently afk but I’ll read the guide you mentioned and look at the PR as soon as possible.

[maxlaverse]

Hi @aneveux ! I've dropped support for Java 8 on master. Could you merge master into your branch so we can see if everything is green ?

[maxlaverse]

Can we make this monthly or does one of you want to look at it every week eventually ? Asking because I already receive a lot of dependabot notifications.

[aneveux]

Sure 👍 I can't agree more about DB notifications 😛

[maxlaverse]

Thanks @aneveux !

[aneveux]

You're welcome, thanks a lot for merging <3