Update dependency org.scala-lang:scala-library to v2.13.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.scala-lang:scala-library (source)	2.13.14 -> 2.13.15

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Release Notes

scala/scala (org.scala-lang:scala-library)

### [`v2.13.15`](https://redirect.github.com/scala/scala/compare/v2.13.14...v2.13.15) [Compare Source](https://redirect.github.com/scala/scala/compare/v2.13.14...v2.13.15)

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