Update dependency io.sentry:sentry-android to v8.21.1

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This PR contains the following updates:

Package	Change	Age	Confidence
io.sentry:sentry-android	8.20.0 -> 8.21.1

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Release Notes

getsentry/sentry-java (io.sentry:sentry-android)

v8.21.1

Compare Source

Fixes

• Use Kotlin stdlib 1.9.24 dependency instead of 2.2.0 for all Android modules (#​4707)
  • This fixes compile time issues if your app is using Kotlin < 2.x

v8.21.0

Compare Source

Fixes

• Only set log template for logging integrations if formatted message differs from template (#​4682)

Features

• Add support for Spring Boot 4 and Spring 7 (#​4601)
  • NOTE: Our sentry-opentelemetry-agentless-spring is not working yet for Spring Boot 4. Please use sentry-opentelemetry-agent until OpenTelemetry has support for Spring Boot 4.
• Replace UUIDGenerator implementation with Apache licensed code (#​4662)
• Replace Random implementation with MIT licensed code (#​4664)
• Add support for vars attribute in SentryStackFrame (#​4686)
  • Breaking change: The type of the vars attribute has been changed from Map<String, String> to Map<String, Object>.

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