build(deps-dev): bump @azure-tools/spec-gen-sdk from 0.9.3 to 0.9.4 (#39240)

Bumps [@azure-tools/spec-gen-sdk](https://github.com/Azure/azure-sdk-tools) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/Azure/azure-sdk-tools/releases)
- [Commits](https://github.com/Azure/azure-sdk-tools/commits)

---
updated-dependencies:
- dependency-name: "@azure-tools/spec-gen-sdk"
  dependency-version: 0.9.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]