fix(deps): update io.sentry:sentry-bom to v8.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.sentry:sentry-bom	8.20.0 -> 8.21.0

---

Release Notes

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

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>.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.