chore: consolidate install to requirements with hash (#249)

* chore: consolidate install to requirements with hash

* chore: update owlbot

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* chore: update owlbot

* chore: update dependencies and install path

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: dandhlee

.kokoro/generate-docs.sh

@@ -29,12 +29,8 @@ export GOOGLE_APPLICATION_CREDENTIALS=$KOKORO_KEYSTORE_DIR/73713_docuploader_ser
 gcloud auth activate-service-account --key-file ${GOOGLE_APPLICATION_CREDENTIALS}
 
 # Install dependencies.
-python3 -m pip install --user --quiet --upgrade nox
-python3 -m pip install --user gcp-docuploader
+python3 -m pip install --require-hashes -r .kokoro/requirements.txt
 python3 -m pip install -e .
-python3 -m pip install recommonmark
-# Required for some client libraries:
-python3 -m pip install --user django==2.2 ipython
 
 # Store the contents of bucket log in a variable to reuse.
 python_bucket_items=$(gsutil ls "gs://docs-staging-v2/docfx-python*")

.kokoro/requirements.in

@@ -5,4 +5,11 @@ typing-extensions
 twine
 wheel
 setuptools
-nox
+nox
+tox
+sphinx==4.5.0
+recommonmark
+django==2.2
+ipython
+black==22.8.0
+parameterized==0.8.1