Bump io.opentelemetry:opentelemetry-bom-alpha (#705)

Bumps [io.opentelemetry:opentelemetry-bom-alpha](https://github.com/open-telemetry/opentelemetry-java) from 1.37.0-alpha to 1.38.0-alpha.
- [Release notes](https://github.com/open-telemetry/opentelemetry-java/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-java/commits)

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

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

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ zipkinAws="1.2.4"
 otelBom="1.37.0"
 logback = "1.5.6"
 wavefrontSdk="3.4.3"
-otelBomAlpha="1.37.0-alpha"
+otelBomAlpha="1.38.0-alpha"
 log4j = "2.23.1"
 wavefrontReporter="1.7.16"
 slf4j = "1.7.36"