Bump org.testcontainers:testcontainers from 1.20.6 to 1.21.0 (#15373)

Bumps [org.testcontainers:testcontainers](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
  dependency-version: 1.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

dubbo-config/dubbo-config-api/pom.xml

@@ -237,7 +237,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
-      <version>1.20.6</version>
+      <version>1.21.0</version>
       <scope>test</scope>
     </dependency>
 

dubbo-dependencies-bom/pom.xml

@@ -167,7 +167,7 @@
 
     <jaxb_version>2.2.7</jaxb_version>
     <activation_version>1.2.0</activation_version>
-    <test_container_version>1.20.6</test_container_version>
+    <test_container_version>1.21.0</test_container_version>
     <hessian_lite_version>4.0.3</hessian_lite_version>
     <swagger_version>1.6.15</swagger_version>