Update dependency org.apache.logging.log4j:log4j-core to v2.12.4 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
org.apache.logging.log4j:log4j-core (source)	compile	minor	2.6.1 -> 2.12.3

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	10.0	CVE-2021-44228	#131
High	9.8	CVE-2017-5645	#8
High	9.0	CVE-2021-45046	#135
Medium	6.6	CVE-2021-44832	#139
Medium	5.9	CVE-2021-45105	#136

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