Update dependency io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha to v2.1.0-alpha

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha	2.0.0-alpha -> 2.1.0-alpha

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[trask]

@breedx-splk it may be better to keep the old / deprecated container.image.tag resource attribute for now, I'm not sure if there's going to be a transition plan for container resource attributes changes

cc @open-telemetry/semconv-container-approvers

[breedx-splk]

@breedx-splk it may be better to keep the old / deprecated container.image.tag resource attribute for now, I'm not sure if there's going to be a transition plan for container resource attributes changes

cc @open-telemetry/semconv-container-approvers

Yeah, I did wonder about that. We'll have to suppress the deprecation warnings then, otherwise the build fails. Lemme try that instead...