chore(multiple samples): Update requests dependencies (#14386)

* chore(multiple samples): Update requests dependencies

 - Regenerated `requirements.txt` in `dataflow/flex-templates/pipeline_with_dependencies` using pip-compile to update
     dependencies for Python 3.13 and a new package index.
 - Removed pytest version constraint in `requirements-test.txt`.
 - Bumped `requests` to 2.34.2 in `run/mcp-server/uv.lock`.

* undo changes to a generated file.

* remove staging artifact registry index.

Author: XrossFox

dataflow/flex-templates/pipeline_with_dependencies/requirements-test.txt

@@ -17,5 +17,5 @@
 google-api-python-client==2.87.0
 google-cloud-storage==2.9.0
 pytest-xdist==3.3.0
-pytest==9.0.3; python_version >= "3.10"
+pytest==9.0.3
 pyyaml==6.0