chore: add cloud-sdk-python-team as co-owner for samples (#1294)

Author: parthea

packages/google-cloud-bigtable/.github/CODEOWNERS

@@ -9,4 +9,4 @@
 *     @googleapis/yoshi-python @googleapis/api-bigtable @googleapis/api-bigtable-partners
 
 # @googleapis/python-samples-reviewers @googleapis/api-bigtable @googleapis/api-bigtable-partners are the default owners for samples changes
-/samples/   @googleapis/python-samples-reviewers @googleapis/api-bigtable @googleapis/api-bigtable-partners
+/samples/   @googleapis/python-samples-reviewers @googleapis/api-bigtable @googleapis/api-bigtable-partners @googleapis/cloud-sdk-python-team