Bump org.testcontainers:testcontainers-bom (spring-projects#10169)

Bumps the development-dependencies group with 1 update: [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java).


Updates `org.testcontainers:testcontainers-bom` from 1.21.2 to 1.21.3
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.21.2...1.21.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers-bom
  dependency-version: 1.21.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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

Author: dependabot[bot]

build.gradle

@@ -107,7 +107,7 @@ ext {
     springSecurityVersion = '6.5.1'
     springVersion = '6.2.8'
     springWsVersion = '4.1.0'
-    testcontainersVersion = '1.21.2'
+    testcontainersVersion = '1.21.3'
     tomcatVersion = '11.0.8'
     xmlUnitVersion = '2.10.3'
     xstreamVersion = '1.4.21'