Update dependency org.apache.logging.log4j:log4j-core to v2.12.2

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This PR contains the following updates:

Package	Type	Update	Change
org.apache.logging.log4j:log4j-core (source)	compile	minor	2.9.0 -> 2.12.2

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

Severity	CVSS Score	CVE	GitHub Issue
Critical	10.0	CVE-2021-44228	#248
Critical	9.0	CVE-2021-45046	#259

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