Bump org.testcontainers:testcontainers-bom from 1.20.6 to 1.21.0

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.20.6 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@1.20.6...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]

pom.xml

@@ -92,7 +92,7 @@ under the License.
       <dependency>
         <groupId>org.testcontainers</groupId>
         <artifactId>testcontainers-bom</artifactId>
-        <version>1.20.6</version>
+        <version>1.21.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>