chore(deps): update dependency ts-morph to v15.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ts-morph	15.0.0 -> 15.1.0

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Release Notes

dsherret/ts-morph

### [`v15.1.0`](https://togithub.com/dsherret/ts-morph/releases/tag/15.1.0) [Compare Source](https://togithub.com/dsherret/ts-morph/compare/15.0.0...15.1.0) ##### Bug Fixes - `DocumentSpan` should attempt to load the source file if it's not loaded yet ([#​1291](https://togithub.com/dsherret/ts-morph/issues/1291)) ([1eda69c](https://togithub.com/dsherret/ts-morph/commit/1eda69c)) - Included symlinked directories when reading a directory ([#​1290](https://togithub.com/dsherret/ts-morph/issues/1290)) ([f1b4ea2](https://togithub.com/dsherret/ts-morph/commit/f1b4ea2)) ##### Features - Add `Symbol#isOptional` method ([#​1285](https://togithub.com/dsherret/ts-morph/issues/1285)) ([c7f3512](https://togithub.com/dsherret/ts-morph/commit/c7f3512)) - Add `Type#isTemplateLiteral` method ([#​1288](https://togithub.com/dsherret/ts-morph/issues/1288)) ([284a7fd](https://togithub.com/dsherret/ts-morph/commit/284a7fd))

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