Bump @splunk/otel from 2.11.0 to 2.12.0 in /nodejs (#290)

Bumps [@splunk/otel](https://github.com/signalfx/splunk-otel-js) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/signalfx/splunk-otel-js/releases)
- [Changelog](https://github.com/signalfx/splunk-otel-js/blob/main/CHANGELOG.md)
- [Commits](signalfx/splunk-otel-js@v2.11.0...v2.12.0)

---
updated-dependencies:
- dependency-name: "@splunk/otel"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>