[Snyk] Security upgrade update-notifier from 2.2.0 to 6.0.0

[gregswindle]

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-SEMVER-3247795](https://snyk.io/vuln/SNYK-JS-SEMVER-3247795) | Yes | Proof of Concept (*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: update-notifier

The new version differs by 57 commits.

• 311557e 6.0.0
• 9183541 Require Node.js 14 and move to ESM
• 3fdb218 5.1.0
• 73c391b Upgrade dependencies
• 0a6027e Move to GitHub Actions
• d8fa601 Rename `master` branch to `main`
• f63b2eb 5.0.1
• 9e2b772 Update dependencies
• da7c464 5.0.0
• 5b440c2 Require Node.js 10
• 3dfe42d Don't suggest to upgrade to lower version (#192)
• 132b7ce Remove a project from "Users" section (#191)
• c9d2166 4.1.1
• f42fc8f Improve vertical alignment of the notifier output (#183)
• 71a3f19 Use HTTPS links
• 64c5236 Fix Travis
• 9d9f4ff 4.1.0
• 4062f12 Update dependencies
• adbeb6e Add template support for the `message` option (#175)
• adf7803 4.0.0
• fb5161c Remove the `callback` option (#158)
• 39682de Rename `boxenOpts` option to `boxenOptions`
• bc1721a Avoid showing notification if current version is the latest (#174)
• ccaf686 Update dependencies

See the full diff

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