chore(deps): update OpenTelemetry to 1.38.0

[jd]

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[mergify]

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[Copilot]

Pull Request Overview

Updates OpenTelemetry dependencies to 1.38.0 and aligns a test expectation with the new error message format.

• Bump opentelemetry-exporter-otlp-proto-http and opentelemetry-sdk to ^1.38.0.
• Adjust test assertion to match updated OpenTelemetry error wording (“Failed to export span batch ...”).

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Bumps OpenTelemetry SDK and OTLP HTTP exporter to ^1.38.0 to adopt latest features/fixes.
mergify_cli/tests/ci/junit_processing/test_upload.py	Updates expected error substring to match new OpenTelemetry error message format.

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