build(deps): bump opentelmetry.version from 2.25.0 to 2.26.0 in /apps/opik-backend (#5670)

* build(deps): bump opentelmetry.version in /apps/opik-backend

Bumps `opentelmetry.version` from 2.25.0 to 2.26.0.

Updates `io.opentelemetry.instrumentation:opentelemetry-instrumentation-annotations` from 2.25.0 to 2.26.0
- [Release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-java-instrumentation@v2.25.0...v2.26.0)

Updates `io.opentelemetry.instrumentation:opentelemetry-r2dbc-1.0` from 2.25.0-alpha to 2.26.0-alpha
- [Release notes](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-java-instrumentation/commits)

---
updated-dependencies:
- dependency-name: io.opentelemetry.instrumentation:opentelemetry-instrumentation-annotations
  dependency-version: 2.26.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.opentelemetry.instrumentation:opentelemetry-r2dbc-1.0
  dependency-version: 2.26.0-alpha
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

* Update pom.xml

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Andres Cruz <andresc@comet.com>

Author: dependabot[bot]

apps/opik-backend/pom.xml

@@ -31,7 +31,7 @@
         <uuid.java.generator.version>5.2.0</uuid.java.generator.version>
         <wiremock.version>3.13.1</wiremock.version>
         <redisson.version>3.52.0</redisson.version>
-        <opentelmetry.version>2.25.0</opentelmetry.version>
+        <opentelmetry.version>2.26.0</opentelmetry.version>
         <aws.java.sdk.version>2.42.4</aws.java.sdk.version>
         <json-path.version>3.0.0</json-path.version>
         <mainClass>com.comet.opik.OpikApplication</mainClass>