update .githug/CODEOWNERS

Author: dizcology

.github/CODEOWNERS

@@ -72,6 +72,7 @@
 /translate/**/*                        @GoogleCloudPlatform/dee-data-ai @GoogleCloudPlatform/python-samples-reviewers
 /video/transcoder/*                    @GoogleCloudPlatform/dee-data-ai @GoogleCloudPlatform/python-samples-reviewers
 /bigquery-connection/**/*                    @GoogleCloudPlatform/dee-data-ai @GoogleCloudPlatform/python-samples-reviewers
+/bigquery-reservation/**/*             @GoogleCloudPlatform/dee-data-ai @GoogleCloudPlatform/python-samples-reviewers
 
 # Cloud SDK Databases & Data Analytics teams
 # ---* Cloud Native DB