Bump io.opentelemetry:opentelemetry-bom from 1.55.0 to 1.56.0

Bumps [io.opentelemetry:opentelemetry-bom](https://github.com/open-telemetry/opentelemetry-java) from 1.55.0 to 1.56.0.
- [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@v1.55.0...v1.56.0)

---
updated-dependencies:
- dependency-name: io.opentelemetry:opentelemetry-bom
  dependency-version: 1.56.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

httpclient5-observation/pom.xml

@@ -41,7 +41,7 @@
       <dependency>
         <groupId>io.opentelemetry</groupId>
         <artifactId>opentelemetry-bom</artifactId>
-        <version>1.55.0</version>
+        <version>1.56.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>