Upgrade log4j dependency

Upgrade log4j in Client-core.

The current version is old and suffers from the following vulnerability:

• https://nvd.nist.gov/vuln/detail/CVE-2019-17571

Should be updated to log4j 2.16 also to fix the following vulnerabilities:

• https://nvd.nist.gov/vuln/detail/CVE-2021-44228
• https://nvd.nist.gov/vuln/detail/CVE-2021-45046