Bump io.opentelemetry:opentelemetry-sdk-testing from 1.56.0 to 1.57.0

Bumps [io.opentelemetry:opentelemetry-sdk-testing](https://github.com/open-telemetry/opentelemetry-java) from 1.56.0 to 1.57.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-java/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-java@v1.56.0...v1.57.0)

---
updated-dependencies:
- dependency-name: io.opentelemetry:opentelemetry-sdk-testing
  dependency-version: 1.57.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -188,7 +188,7 @@
       <dependency>
         <groupId>io.opentelemetry</groupId>
         <artifactId>opentelemetry-sdk-testing</artifactId>
-        <version>1.56.0</version>
+        <version>1.57.0</version>
         <scope>test</scope>
       </dependency>
     </dependencies>