securitycenter: Some v2 code samples use the v1 API

[hegemonic]

In which file did you encounter the issue?

https://github.com/GoogleCloudPlatform/python-docs-samples/blob/98d8ab50/securitycenter/snippets_v2/snippets_findings_v2.py

Did you change the file? If so, how?

no

Describe the issue

This file is supposed to contain samples for the Security Command Center v2 API. That means each sample needs to import google.cloud.securitycenter_v2:

from google.cloud import securitycenter_v2

client = securitycenter_v2.SecurityCenterClient()

However, the securitycenter_update_source_v2 and securitycenter_list_sources_v2 samples use the v1 API:

from google.cloud import securitycenter

client = securitycenter.SecurityCenterClient()

CC: @owenhuyn

[rsamborski]

@vijaykanthm PTAL