Bump the log4j dependency version to v2.21.1 #98
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The log4J dependencies in this application was/is to version 2.17.0 which still has the critical log4shell vulnerability that was patched almost 2 years ago. See https://logging.apache.org/log4j/2.x/index.html#important-security-vulnerability-cve-2021-44832
This PR updates both to v2.21.1, which is the current stable and supported version of log4j.
It would supersede #87