Bump org.springframework:spring-framework-bom from 6.1.20 to 6.1.21 (#3108)

Bumps [org.springframework:spring-framework-bom](https://github.com/spring-projects/spring-framework) from 6.1.20 to 6.1.21.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v6.1.20...v6.1.21)

---
updated-dependencies:
- dependency-name: org.springframework:spring-framework-bom
  dependency-version: 6.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -72,7 +72,7 @@ ext {
 	snappyVersion = '1.1.10.7'
 	springDataVersion = '2023.1.12'
 	springRetryVersion = '2.0.12'
-	springVersion = '6.1.20'
+	springVersion = '6.1.21'
 	testcontainersVersion = '1.19.8'
 	zstdJniVersion = '1.5.7-3'