Update dependency org.springframework.cloud:spring-cloud-sleuth to v2.1.5.RELEASE

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This PR contains the following updates:

Package	Update	Change
org.springframework.cloud:spring-cloud-sleuth	patch	2.1.2.RELEASE -> 2.1.5.RELEASE

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Release Notes

spring-cloud/spring-cloud-sleuth

### [`v2.1.5.RELEASE`](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.4.RELEASE...v2.1.5.RELEASE) [Compare Source](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.4.RELEASE...v2.1.5.RELEASE) ### [`v2.1.4.RELEASE`](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.3.RELEASE...v2.1.4.RELEASE) [Compare Source](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.3.RELEASE...v2.1.4.RELEASE) ### [`v2.1.3.RELEASE`](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.2.RELEASE...v2.1.3.RELEASE) [Compare Source](https://togithub.com/spring-cloud/spring-cloud-sleuth/compare/v2.1.2.RELEASE...v2.1.3.RELEASE)

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