feat: Adds TypeAnnotationCode PG_JSONB (#792)

* feat: Adds auto-generated CL for googleapis for jsonb

PiperOrigin-RevId: 470167051

Source-Link: googleapis/googleapis@343f52c

Source-Link: googleapis/googleapis-gen@a416799
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYTQxNjc5OWEzNzI2OTkxMmZhMGNmZGUyNzljZTUwYjdjMzY3MGRiMSJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google/cloud/spanner_v1/types/type.py

@@ -60,6 +60,7 @@ class TypeAnnotationCode(proto.Enum):
     """
     TYPE_ANNOTATION_CODE_UNSPECIFIED = 0
     PG_NUMERIC = 2
+    PG_JSONB = 3
 
 
 class Type(proto.Message):