[Automation] Bump product version numbers

[elastic-observability-automation]

Bump release versions in the config/versions.yml

Update config/versions.yml apm-agent-node 4.15.0

change detected: * key "$.versioning_systems.apm-agent-node.current" updated from "4.14.0" to "4.15.0", in file "config/versions.yml"

v4.15.0

For more information, please see the [changelog](https://www.elastic.co/guide/en/apm/agent/nodejs/current/release-notes-4.x.html#release-notes-4.15.0).

### Elastic APM Node.js agent layer ARNs

|Region|ARN|
|------|---|
|af-south-1|arn:aws:lambda:af-south-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-east-1|arn:aws:lambda:ap-east-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-northeast-1|arn:aws:lambda:ap-northeast-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-northeast-2|arn:aws:lambda:ap-northeast-2:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-northeast-3|arn:aws:lambda:ap-northeast-3:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-south-1|arn:aws:lambda:ap-south-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-southeast-1|arn:aws:lambda:ap-southeast-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-southeast-2|arn:aws:lambda:ap-southeast-2:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ap-southeast-3|arn:aws:lambda:ap-southeast-3:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|ca-central-1|arn:aws:lambda:ca-central-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-central-1|arn:aws:lambda:eu-central-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-north-1|arn:aws:lambda:eu-north-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-south-1|arn:aws:lambda:eu-south-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-west-1|arn:aws:lambda:eu-west-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-west-2|arn:aws:lambda:eu-west-2:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|eu-west-3|arn:aws:lambda:eu-west-3:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|il-central-1|arn:aws:lambda:il-central-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|me-south-1|arn:aws:lambda:me-south-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|sa-east-1|arn:aws:lambda:sa-east-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|us-east-1|arn:aws:lambda:us-east-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|us-east-2|arn:aws:lambda:us-east-2:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|us-west-1|arn:aws:lambda:us-west-1:267093732750:layer:elastic-apm-node-ver-4-15-0:1|
|us-west-2|arn:aws:lambda:us-west-2:267093732750:layer:elastic-apm-node-ver-4-15-0:1|

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