Bump EDOT Collector to consume the latest Collector Core (0.138.0 and 0.20.0)

[pierrehilbert]

Issue

Bump EDOT Collector to use:

• 0.128.0 for upstream dependencies
• 0.20.0 for Elastic specific dependencies

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[ChrsMark]

FYI 0.139.0 has been released: https://github.com/open-telemetry/opentelemetry-collector/releases/tag/v0.139.0