Bump com.netflix.spectator:spectator-reg-atlas from 1.7.19 to 1.7.21 (#5505)

Bumps [com.netflix.spectator:spectator-reg-atlas](https://github.com/Netflix/spectator) from 1.7.19 to 1.7.21.
- [Release notes](https://github.com/Netflix/spectator/releases)
- [Changelog](https://github.com/Netflix/spectator/blob/main/CHANGELOG.md)
- [Commits](Netflix/spectator@v1.7.19...v1.7.21)

---
updated-dependencies:
- dependency-name: com.netflix.spectator:spectator-reg-atlas
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -73,7 +73,7 @@ reactor = "2022.0.22"
 rest-assured = "5.4.0"
 signalfx = "1.0.45"
 slf4j = "1.7.36"
-spectator-atlas = "1.7.19"
+spectator-atlas = "1.7.21"
 spring = "5.3.37"
 spring-javaformat = "0.0.43"
 testcontainers = "1.19.8"