fix CI dependency bug

[oliviamiller]

Summary

This PR fixes a dependency conflict and CI build issue introduced by the tflite support PR.

After merging tflite support, the main branch CI failed because:

• numpy==1.26.4 (required for tflite-runtime 2.14.0 compatibility) conflicted with newer versions of scipy and onnxruntime that the CI pip resolved to on a fresh install
• The PR CI appeared to pass because viamrobotics/build-action was building the base branch (main) rather than the PR branch code — so dep changes were never actually tested in CI

Changes:

• pin openwakeword transitive dependencies to prevent CI from picking up an incompatable version
• build.yml — pass correct to the build action so the Viam cloud build actually tests PR branch code instead of always building main

Review
1 Approval needed