Work-around for Jackson & instrumentation issues on Java15+

[SylvainJuge]

What does this PR do?

Work-around for compatibility issue with Jackson JSON serialization on Java 15 and 16.
Also, rollback jackson version to 2.12.x branch to ensure Java7 compatibility (2.13.x is built with Java 8) (see doc)

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• Start Time: 2021-08-20T09:39:36.087+0000

• Duration: 56 min 46 sec

• Commit: 7771dd2

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Failed	0
Passed	2379
Skipped	19
Total	2398

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Passed	2379
Skipped	19
Total	2398

[SylvainJuge]

FYI I realized that changing jackson version is not as trivial as it sounds as we have it in many levels of maven dependencies.
For example, mixing spring-boot versions with the one we already have through core module tends to conflict and create weird classloading issues because jackson dependencies structure changed (thus inclusions/exclusions do not work as expected).

Thus we can consider this still WIP until proper review is required.

[SylvainJuge]

Update: should be ready to review/merge, even if the build still does not run without error on Jdk 14-16.