Upgrade Go to 1.26.7 and OpenTelemetry to v1.46.0

[thomasmaas]

Summary

• Upgrade Go toolchain from 1.26.4 to 1.26.7
• Upgrade go.opentelemetry.io/otel and related packages to v1.46.0

Test plan

• Unit tests pass
• Image builds successfully

🤖 Generated with Claude Code

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[thomasmaas]

Closing — fix will be cherry-picked to release-0.27 after the main PR merges.