fix(deps): update opentelemetry-java-contrib monorepo to v1.56.0-alpha (#18374)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: renovate[bot]

dependencyManagement/build.gradle.kts

@@ -6,7 +6,7 @@ data class DependencySet(val group: String, val version: String, val modules: Li
 
 // this line is managed by .github/scripts/update-sdk-version.sh
 val otelSdkVersion = "1.61.0"
-val otelContribVersion = "1.55.0-alpha"
+val otelContribVersion = "1.56.0-alpha"
 val otelSdkAlphaVersion = otelSdkVersion.replaceFirst("(-SNAPSHOT)?$".toRegex(), "-alpha$1")
 
 // Need both BOM and groovy jars