Update dependency ember-cli-typescript to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ember-cli-typescript	dependencies	major	^3.1.4 -> ^4.0.0

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Release Notes

typed-ember/ember-cli-typescript

v4.0.0

Compare Source

Breaking 💥

• Drop support for Node 8 (#​1017)
• Don't configure Babel for TS transpilation (#​1018)

Added ⭐️

• Don't run type-checking middleware when an existing build is used via --path ([#​1148])

Changed 💥

• Update tsconfig.json blueprint target value to 2020 ([#​1108])
• Use prepack and postpack instead of prepublishOnly and postpublish ([#​1196])

Fixed 🔧

• Bring apps closer to type-checking out of the box ([#​1169])

Under the hood 🚗

• Upgrade ✨ Prettier ✨ to a version that supports optional chaining and nullish coalescing (#​1018)
• Add test for optional chaining and nullish coalescing (#​1018)
• Add test for class field declaration (#​1018)
• Add RFCs to repo ([#​1157])
• Fix description of ts:precompile ([#​1162])
• Fix dead link to "packages this addon installs" ([#​1164])
• Get CI passing ([#​1167])
• Avoid false-positive willTypechecks on Linux ([#​1198])
• Dependency updates (4.0.0-deps-bumps, [#​1191])

Upgrading ⚙️

• Make sure you are using at least ember-cli-babel@^7.17.0 or your .ts files will be ignored completely!
• If you are using ember-auto-import, make sure you are using at least ember-auto-import@^1.6.0.
• Run ember install ember-cli-typescript@^4.0.0 or use your package manager to upgrade to ember-cli-typescript@^4.0.0 directly and skip the blueprint.

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