[DOC] Use sphinxcontrib-needs versions < 0.6.0

[DOC] Use sphinxcontrib-needs versions < 0.6.0

This latest version introduces a new services support functionality
- that cannot be easily disabled here
- and that requires additional configuration parameters to link GitHub issues.
We cannot provide these parameters since this project uses JIRA.
As a result, sphinx generates a warning.
https://sphinxcontrib-needs.readthedocs.io/en/service/services/index.html

Issue-ID: DOC-692
Signed-off-by: Guillaume Lambert <guillaume.lambert@orange.com>
Change-Id: I3bfa231467804729deacbe70f1180c06b3eec978
(cherry picked from commit a6727b341c055284b8a7fb9a28196b4475d36abf)