Remove explicit log4j version

- Removed the explicit log4j version 2.17.1
- Upgraded spring boot maven plugin to 2.6.4

Issue-ID: CPS-962
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
Change-Id: I4753577f55ae256fcf1e1b6df7d7062c1ffa16ad
1 file changed