Update dependency opentelemetry-exporter-otlp-metrics to '~> 0.12.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence	Diffend
opentelemetry-exporter-otlp-metrics (source, changelog)	'~> 0.11.0' → '~> 0.12.0'					Diff

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Release Notes

open-telemetry/opentelemetry-ruby (opentelemetry-exporter-otlp-metrics)

v0.12.0: opentelemetry-exporter-otlp-metrics 0.12.0

v0.12.0 / 2026-09-09

• BREAKING CHANGE: Align with the spec for metrics sdk and metrics otlp exporter (#​2301)
• FIXED: Align with the spec for metrics sdk and metrics otlp exporter (#​2301)

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rspec: [cloud]

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Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/16713878718/artifacts/tmp/coverage/index.html
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1875 examples, 0 failures
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[TEST PROF INFO] Time spent in factories: 00:24.334 (47.27% of total time)

rspec: [ce]

Coverage report available at https://code0-tech.gitlab.io/-/development/sagittarius/-/jobs/16713878717/artifacts/tmp/coverage/index.html
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1809 examples, 0 failures
Line Coverage: 93.39% (6624 / 7093)
[TEST PROF INFO] Time spent in factories: 00:24.833 (47.4% of total time)

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