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

@@ -47,7 +47,7 @@
     <junit-jupiter-version>5.12.2</junit-jupiter-version>
     <log4j2-version>2.24.3</log4j2-version>
     <slf4j-version>1.7.36</slf4j-version>
-    <testcontainers-version>1.20.6</testcontainers-version>
+    <testcontainers-version>1.21.0</testcontainers-version>
 
     <build-helper-maven-plugin-version>3.6.0</build-helper-maven-plugin-version>
     <central-publishing-maven-plugin-version>0.7.0</central-publishing-maven-plugin-version>