Update mongoose to version 4.9.9 🚀

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Hello lovely humans,

mongoose just published its new version 4.9.9.

State	Update 🚀
Dependency	mongoose
New version	4.9.9
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of mongoose.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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The new version differs by 2258 commits .

• 5f0ce6e chore: release 4.9.9
• d5da9ca fix(connection): set $hasHandler on promises returned from openSet()
• 1f16739 style: fix lint
• 2d459ec refactor(connection): don't use promise for createConnection()
• be8a6e4 refactor(connection): move openSet args logic into separate function
• 0eda07a fix(document): don't emit model error if callback specified for consistency with docs
• 7182998 test(document): repro #5216
• e74c9d3 fix(connection): don't throw if .catch() on open() promise
• edd0207 test(connection): repro #5229 part 1
• 9c05394 fix(schema): allow update with $currentDate for updatedAt to succeed
• c55da9c test: repro #5222
• 9986f0a docs(query): correct type for Query#regex()
• eed8bcd fix(document): handle errors in subdoc pre validate
• 9f24e99 test(document): repro #5215
• 6942c34 Merge branch 'master' of github.com:Automattic/mongoose

There are 250 commits in total. See the full diff.