Fixes for CI pipelines

[abelsromero]

Thank you for opening a pull request and contributing to AsciidoctorJ!

Please take a bit of time giving some details about your pull request:

Kind of change

• [ ] Bug fix
• [ ] New non-breaking feature
• [ ] New breaking feature
• [ ] Documentation update
• [x] Build improvement

Description

What is the goal of this pull request?

Fixes in pipelines

How does it achieve that?

• Execution exclude for mac-os was not aplied ('1.x' syntax no longer works)
• Test upstream 'if' condition was not being applied ever. Not it runs on ubuntu for 11 & 17
• Increase max-parellel to 4 to shorten total time

Are there any alternative ways to implement this?

No that I know.

Are there any implications of this pull request? Anything a user must know?

I'd also like to split "Test upstream" in a different job so it's shown in the actions UI and we don't miss it again. It will require some config duplication but I think it's worth it.

Issue

If this PR fixes an open issue, please add a line of the form:

Fixes #Issue

Release notes

Please add a corresponding entry to the file CHANGELOG.adoc

[robertpanzer]

Thanks! I somehow missed checking the changes when upgrading from setup-java v1 to v2.

[abelsromero]

I'd also like to split "Test upstream" in a different job so it's shown in the actions UI and we don't miss it again. It will require some config duplication but I think it's worth it.

opinions on ☝️ ?

[robertpanzer]

I would be fine with that.