[Snyk] Security upgrade log4js from 6.3.0 to 6.4.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • packages/backend/package.json
  • packages/backend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	561/1000 Why? Recently disclosed, Has a fix available, CVSS 5.5	Information Exposure SNYK-JS-LOG4JS-2348757	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: log4js

The new version differs by 126 commits.

• 9fdbed5 6.4.0
• 788c7a8 Merge pull request #1150 from log4js-node/update-changelog
• 7fdb141 chore: updated changelog for 6.4.0
• e6bd888 Merge pull request #1151 from log4js-node/feat-zero-backup
• ac599e4 allow for zero backup - in sync with https://github.com/log4js-node/streamroller/pull/74
• 53248cd Merge pull request #1149 from log4js-node/migrate-daysToKeep-to-numBackups
• 436d9b4 Merge pull request #1148 from log4js-node/update-docs
• d6b017e chore(docs): updated fileSync.md and misc comments
• d4617a7 chore(deps): migrated from daysToKeep to numBackups due to streamroller@^3.0.0
• 0ad0133 Merge pull request #1147 from log4js-node/update-deps
• 773962b Merge pull request #1146 from log4js-node/update-deps
• 823bb46 Merge pull request #1145 from log4js-node/update-deps
• 6cc0035 chore(deps): bump streamroller from 3.0.1 to 3.0.2
• 0f39859 chore(deps): bump date-format from 4.0.2 to 4.0.3
• 85ac31e chore(deps-dev): bump eslint from from 8.6.0 to 8.7.0
• acd41ef Merge pull request #1144 from log4js-node/refactor
• 4c4bbe8 chore(refactor): using writer.writable instead of alive for checking
• e86a809 Merge pull request #1097 from 4eb0da/datefile-error-handling
• 34ab3b2 Merge pull request #1143 from log4js-node/update-test
• 8cba85f chore(test): renamed tap.teardown() to tap.tearDown() for consistency (while both works, only tap.tearDown() is documented)
• a0baec2 chore(test): fixed teardown() causing tests to fail due to fs errors on removal
• 51ac865 Merge pull request #1103 from polo-language/recording-typescript
• 653a20f Merge pull request #1028 from techmunk/master
• 43a2199 chore(test): Changed default TAP test suite timeout from 30s to 45s because Windows takes a long time

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