Require Java 8 for jacoco-maven-plugin

[Godin]

This change will

• unblock Upgrade maven-plugin-plugin to 3.8.2 #1462
• allow to solve Maven 4 compatibility / Maven 3.9 warnings #1435 differently than proposed in Maven 3.9.2 should not produce warnings for jacoco-maven-plugin #1438

[Godin]

@marchof if you're agree with this change, then I'll finalize this PR by updating changelog

[marchof]

@Godin I agree with this change!

[irbian]

Looks like this change has broken some of our oldest builds based on java 7

Normally called as org.jacoco:jacoco-maven-plugin:prepare-agent , without specifying version, now uses 0.8.11 instead of 0.8.10

Would this have happened anyway if the versioning used were semver? We are looking where exactly is decided what jacoco version is used

[Godin]

Would this have happened anyway if the versioning used were semver?

According to https://semver.org/

Major version zero (0.y.z) is for initial development. Anything MAY change at any time.

😉

---

Your build got broken because

Normally called as org.jacoco:jacoco-maven-plugin:prepare-agent , without specifying version

this is not normal - see https://maven.apache.org/guides/mini/guide-configuring-plugins.html

Important Note: Always define the version of each plugin used to guarantee build reproducibility.

[irbian]

initial development

I see XD

this is not normal - see https://maven.apache.org/guides/mini/guide-configuring-plugins.html

I agree, it surprise me too. I guess that using semver wouldn't had made a difference? without specifying it would have started using 1.0.0 anyway? I have to check where the version to use was decided