[Snyk] Security upgrade loopback from 3.23.2 to 3.28.0

[atherdon]

This PR was automatically created by Snyk using the credentials of a real user.

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: - package.json - package-lock.json #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **658/1000**
**Why?** Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.3 | Regular Expression Denial of Service (ReDoS)
[SNYK-JS-NODEMAILER-6219989](https://snyk.io/vuln/SNYK-JS-NODEMAILER-6219989) | No | Proof of Concept (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: loopback

The new version differs by 78 commits.

• a22d4f9 3.28.0
• 223dd5d Merge pull request #4338 from achrinzafork/chore/update-module-lts-node14
• fbd9783 Merge pull request #4340 from strongloop/upgrade-nodemailer
• 6f04b61 upgrade nodemailer to greater than 6.4.16
• ab3e159 chore: sync LoopBack 4 with Node.js v14 EOL
• 5b61efb Merge pull request #4334 from strongloop/travis
• e457e26 chore: add Node.js 14 to travis
• ab2e462 Merge pull request #4318 from strongloop/bajtos-patch-1
• f2f7332 Remove "major" and "p1" from stalebot
• 06fcaa1 3.27.0
• d929b57 Merge pull request #4315 from strongloop/feat/maintenance-lts
• 58f6545 Update LTS status in README
• cdf48b6 Merge pull request #4303 from strongloop/copyright
• f788aae chore: update copyright year
• 6a7fc52 Merge pull request #4290 from sujeshthekkepatt/fix/hasone-relation-error-message
• b93187b feat: change hasone relation error message
• 2db09a3 Merge pull request #4281 from strongloop/chore/improve-issue-templates
• 4edcc4f chore: disable security issue reporting
• b848bd9 Merge pull request #4283 from strongloop/fix-comma-dangle
• aa76a19 chore: fix eslint violations
• f2f0b3a Merge pull request #4267 from strongloop/update-dev-deps
• 82cd668 fixup! manual fixes
• 397d141 fixup! eslint --fix .
• aec86cc chore: update eslint & eslint-config to latest

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project. ------------ **Note:** *You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.* For more information: 🧐 [View latest project report](https://app.snyk.io/org/atherdon/project/10d3ae2e-9b2a-4078-89b5-39d15d4d2659?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/atherdon/project/10d3ae2e-9b2a-4078-89b5-39d15d4d2659?utm_source=github&utm_medium=referral&page=fix-pr/settings) 📚 [Read more about Snyk's upgrade and patch logic](https://support.snyk.io/hc/en-us/articles/360003891078-Snyk-patches-to-fix-vulnerabilities) [//]: # (snyk:metadata:{"prId":"d6c38371-08c8-4870-94ff-88c3c1a5a2fd","prPublicId":"d6c38371-08c8-4870-94ff-88c3c1a5a2fd","dependencies":[{"name":"loopback","from":"3.23.2","to":"3.28.0"}],"packageManager":"npm","projectPublicId":"10d3ae2e-9b2a-4078-89b5-39d15d4d2659","projectUrl":"https://app.snyk.io/org/atherdon/project/10d3ae2e-9b2a-4078-89b5-39d15d4d2659?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-NODEMAILER-6219989"],"upgrade":["SNYK-JS-NODEMAILER-6219989"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[658],"remediationStrategy":"vuln"}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Regular Expression Denial of Service (ReDoS)](https://learn.snyk.io/lesson/redos/?loc=fix-pr)