Bump matrix-project from 1.14 to 1.15

[dependabot-preview]

Bumps matrix-project from 1.14 to 1.15.

Release notes

Sourced from matrix-project's releases.

1.15

📦 Dependency updates

• Updated parent, deps, BOM (#62) @jglick
• Update POM (#59) @jglick

📝 Documentation updates

• Terminology update (#64) @Zastai
• Use Github as source of documentation (#61) @zbynek

👻 Maintenance

• Fix warnings (#56) @orgads

Changelog

Sourced from matrix-project's changelog.

Changelog

Commits

• 1abff96 [maven-release-plugin] prepare release matrix-project-1.15
• bf01d8e Merge pull request #64 from Zastai/terminology
• 7535ff5 Update references to "slaves" to use "agents" instead.
• e5611eb Improve Dutch help slightly.
• 38afda8 Release Drafter
• db1ce63 Merge pull request #62 from jglick/updates
• 64155e5 Test failures
• 9d496e5 Updated parent, deps, BOM
• b4b503f Remove olivergondza from developer list
• f499446 Merge pull request #56 from orgads/fix-warnings
• Additional commits viewable in compare view

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[jglick]

A bunch of test failures that look legitimate; I need to check them.

[jglick]

At least one failure looks like a genuine regression: jenkinsci/matrix-project-plugin#56 (review)

[jglick]

The others are puzzling. AxisTest fails when run in PCT, specifically when jth.jenkins-war.path is set to the megawar, perhaps because it does not include detached plugins. I tracked it down as far as seeing that MatrixProject.submit receives a JSON form which is missing

  "axis": {
    "name": "",
    "stapler-class": "hudson.matrix.LabelAxis",
    "$class": "hudson.matrix.LabelAxis"
  }

Maybe something about this craziness? https://github.com/jenkinsci/matrix-project-plugin/blob/c7e30722e9956be164080c3243edfe5cf13421e6/src/main/resources/hudson/matrix/MatrixProject/configure-entries.jelly#L63-L66

CC @olivergondza

[dependabot-preview]

Superseded by #254.