Update to JDK11

[big-andy-coates]

Breaking change: Dropping support for Java8 is a breaking change for anyone using Java8. I recommend bumping the major version.

Updates tool chain to Java 11 (LTS), and updates the JGit dependency to the latest (which requires J11). This highlighted issue #573 until the fix was merged.

Updating JGIt to the latest version also highlighted and issue with a package name change for classes in the org.eclipse.jgit:org.eclipse.jgit.ssh.jsch dependency: both JschConfigSessionFactory and OpenSshConfig referenced from SshConnector have moved between JGit version 5.x.x and 6.x.x.

Implications: users of the current plugin with a Gradle build environment that's pulling JGit 6.x.x will likely encounter ClassNotFound style errors if using the SshConnector class.

Build is now green.

[big-andy-coates]

Build failing with expected errors about "java.lang.IllegalStateException: Command org.eclipse.jgit.api.PushCommand was called in the wrong state". Merging #575 will fix these.

[big-andy-coates]

Hummm... looks like the build is now failing because of another plugin not being compatible with J11:

> There was a failure while executing work items
   > A failure occurred while executing org.gradle.plugin.devel.tasks.internal.ValidateAction
      > pl/allegro/tech/build/axion/release/TagPrefixConf has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Bumping com.gradle.plugin-publish to the latest 1.1.0

Update: Looks like this issue: gradle/gradle#23125. Fix is to switch GH workflows to us JDK11, (which makes sense).

[codecov-commenter]

Codecov Report

Merging #577 (671c390) into main (b84cd02) will increase coverage by 0.02%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##               main     #577      +/-   ##
============================================
+ Coverage     61.13%   61.15%   +0.02%     
  Complexity      387      387              
============================================
  Files            81       81              
  Lines          1518     1519       +1     
  Branches        142      142              
============================================
+ Hits            928      929       +1     
  Misses          523      523              
  Partials         67       67              

Impacted Files	Coverage Δ
...axion/release/infrastructure/git/SshConnector.java	0.00% <ø> (ø)
...ech/build/axion/release/domain/VersionFactory.java	89.18% <0.00%> (+0.30%)	⬆️

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[big-andy-coates]

@bgalek ready for review :)

[bgalek]

I just released 14.4.0 and added release notes that we'll be preparing axion@1.15.0 with jdk11 as base ;)

[big-andy-coates]

Yep, I saw 🚀 :)

[bgalek]

I've created v1 branch as a branch to support jdk8