Bump log4js from 4.0.2 to 6.4.0 in /server#8

dependabot[bot] wants to merge 1 commit intomasterIBM/Medical-Blockchain:masterfrom

dependabot/npm_and_yarn/server/log4js-6.4.0IBM/Medical-Blockchain:dependabot/npm_and_yarn/server/log4js-6.4.0Copy head branch name to clipboard