Update Go version for OTLP tests

[jefferbrecht]

Description

OTel released a new SDK version that requires Go >= 1.25.0, which broke our OTLP tests because they use the latest SDK versions and they are pinned to Go 1.24.x.

mirror_content.sh was already run.

Related issue

N/A

How has this been tested?

Will let presubmits run

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.