Update dependency opentelemetry_process_propagator to ~> 0.3

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
opentelemetry_process_propagator	minor	~> 0.2 -> ~> 0.3

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[renovate[bot]]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
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The artifact failure details are included below:

File name: instrumentation/opentelemetry_dataloader/mix.lock

Command failed: mix deps.update opentelemetry_process_propagator
** (Mix) Hex dependency resolution failed

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[bryannaegele]

Dataloader's version has to be pinned due to this pinned dependency in dataloader itself.

[bryannaegele]

@tsloughter any idea why all these tests started failing tonight with this (UndefinedFunctionError) function :otel_tracer_provider_sup.start/2 is undefined or private error? These were all passing the other day and the only thing that got bumped here in the lock files was the api patch version.

[tsloughter]

Maybe upgrade the test SDK being used?