Update dependency ts-morph to v21 (#3134)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [ts-morph](https://togithub.com/dsherret/ts-morph) | [`20.0.0` ->
`21.0.0`](https://renovatebot.com/diffs/npm/ts-morph/20.0.0/21.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/ts-morph/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/ts-morph/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/ts-morph/20.0.0/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/ts-morph/20.0.0/21.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>dsherret/ts-morph (ts-morph)</summary>

###
[`v21.0.0`](https://togithub.com/dsherret/ts-morph/releases/tag/21.0.0)

[Compare
Source](https://togithub.com/dsherret/ts-morph/compare/20.0.0...21.0.0)

#### What's Changed

- feat: `ProjectOptions::defaultCompilerOptions` by
[@&#8203;wojpawlik](https://togithub.com/wojpawlik) in
[dsherret/ts-morph#1460
- feat: TypeScript 5.3
[dsherret/ts-morph#1476
- feat: add interface and type literal getters & setters by
[@&#8203;ajvincent](https://togithub.com/ajvincent) in
[dsherret/ts-morph#1473
- feat: add wrapped method for `getShorthandAssignmentValueSymbol` to
`TypeChecker`. add convenience method for getting the value symbol on
`ShorthandPropertyAssignment`. by
[@&#8203;kronodeus](https://togithub.com/kronodeus) in
[dsherret/ts-morph#1456
- perf: use path.exists functions that don't throw internally when not
exists
[dsherret/ts-morph#1478

##### Breaking Changes

-   Upgraded to TS 5.3
- Underlying `@ts-morph/common` file system methods return undefined
instead of throwing when not exists (for perf).
- Private fields are actually private (default build requires private
fields).

#### New Contributors

- [@&#8203;ajvincent](https://togithub.com/ajvincent) made their first
contribution in
[dsherret/ts-morph#1473

**Full Changelog**:
dsherret/ts-morph@20.0.0...21.0.0

</details>

---

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---

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package.json

@@ -185,7 +185,7 @@
     "tailwindcss-animate": "1.0.7",
     "textarea-caret": "3.1.0",
     "tiny-invariant": "1.3.1",
-    "ts-morph": "20.0.0",
+    "ts-morph": "21.0.0",
     "tsup": "8.0.1",
     "typescript": "5.3.2",
     "unified": "10.1.2",