Regenerate opentelemetry-proto code with v1.9.0 release

Fixes #4804

I also simplified the script to use uv to manage deps

Author: aabmass

opentelemetry-proto/README.rst

@@ -7,9 +7,9 @@ OpenTelemetry Python Proto
    :target: https://pypi.org/project/opentelemetry-proto/
 
 This library contains the generated code for OpenTelemetry protobuf data model. The code in the current
-package was generated using the v1.7.0 release_ of opentelemetry-proto.
+package was generated using the v1.9.0 release_ of opentelemetry-proto.
 
-.. _release: https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v1.7.0
+.. _release: https://github.com/open-telemetry/opentelemetry-proto/releases/tag/v1.9.0
 
 Installation
 ------------