[pixels-lambda] mitigate outdated Log4j2 pulled by Lambda shade transformer

[gengdy1545]

Building pixels-worker-lambda downloads Log4j2 2.13.0 into the local Maven cache via the shade plugin dependency:
com.github.edwgiz:maven-shade-plugin.log4j2-cachefile-transformer:2.13.0. Log4j2 2.13.0 is an outdated open-source release with known security risks.