chore(deps): bump org.testcontainers:testcontainers-bom in /api

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.1...1.21.0)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers-bom
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

api/pom.xml

@@ -20,7 +20,7 @@
 
     <properties>
         <java.version>17</java.version>
-        <testcontainers.version>1.20.1</testcontainers.version>
+        <testcontainers.version>1.21.0</testcontainers.version>
     </properties>
     <dependencyManagement>
         <dependencies>