[Security] Bump property-expr from 2.0.2 to 2.0.4 in /backend

Created by: dependabot-preview[bot]

️ Dependabot Preview has been deactivated ️

This pull request was created by Dependabot Preview, and you've upgraded to Dependabot. This means it won't respond to dependabot commands nor will it be automatically closed if a new version is found.

If you close this pull request, Dependabot will re-create it the next time it checks for updates and everything will work as expected.

---

Bumps property-expr from 2.0.2 to 2.0.4. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Prototype Pollution in property-expr The package property-expr before 2.0.3 are vulnerable to Prototype Pollution via the setter function.

Affected versions: < 2.0.3

Changelog

Sourced from property-expr's changelog.

2.0.4 (2020-08-26)

2.0.3 (2020-08-17)

Bug Fixes

• prototype polution vector (df84691)

Commits

• b135f18 Publish v2.0.4
• 4675e5f Using 'var' instead of 'let' (#14)
• 9a3236c Publish v2.0.3
• df84691 fix: prototype polution vector
• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)