Fixes broken pom by removing versionMapping (#242)

* Fixes broken pom by removing version mapping

The versionMapping block was solely added because the shaded JARs added
earlier were supposed to replace the default artifact. Currently the
shaded JARs are customized with explicit classifiers which is why
explicit versionMapping is not required.

* Empty commit to fix a stuck stylecheck presubmit check

build.gradle

@@ -254,11 +254,6 @@ subprojects {
 							version = versionParts.join("-")
 						}
 					}
-					versionMapping {
-						allVariants {
-							fromResolutionResult()
-						}
-					}
 					pom {
 						name = 'OpenTelemetry Operations Java'
 						url = 'https://github.com/GoogleCloudPlatform/opentelemetry-operations-java'