chore(deps): update dependency nbconvert to v6.5.1 (#1526)

Author: renovate-bot

synthtool/gcp/templates/python_notebooks_testing_pipeline/.cloud-build/requirements.txt

@@ -1,6 +1,6 @@
 ipython==8.4.0
 jupyter==1.0
-nbconvert==6.5.0
+nbconvert==6.5.1
 papermill==2.3
 numpy==1.23.1
 pandas==1.4.3