chore(deps): update dependency google-cloud-documentai to v0.2.0 (GoogleCloudPlatform#3909)

Co-authored-by: Bu Sun Kim <[email protected]>
Co-authored-by: Takashi Matsuo <[email protected]>

Author: 3 people

document/cloud-client/requirements.txt

@@ -1,2 +1,2 @@
-google-cloud-documentai==0.1.0
+google-cloud-documentai==0.2.0
 google-cloud-storage==1.28.1