Improve Docs around Upgrading the underlying SDK [DATACOUCH-357]

[spring-projects-issues]

Michael Nitschinger opened DATACOUCH-357 and commented

Many times we got requests on "how to upgrade the underlying SDK" for bugfixes and other enhancements while still keeping everything else as is.

The docs should cover both the standalone SDC SDK upgrade and also how to do it in a spring boot setting where the version is managed by the parent pom

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No further details from DATACOUCH-357