Can I Update these log4j to an upper version like 2.16?
No, it could well break Bitbucket, and it would render you unsupported.
I'm assuming this is in response to the CVE - see https://community.atlassian.com/t5/Trust-Security-articles/Atlassian-s-Response-to-Log4j-CVE-2021-44228 for the guidance on what to do.
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