docs(python): fix wrong type for on_conflict param (supabase#28637)

Author: grdsdev

apps/docs/spec/supabase_py_v2.yml

@@ -1372,7 +1372,7 @@ functions:
  description: Whether duplicate rows should be ignored.
  - name: on_conflict
  isOptional: true
- type: bool
+ type: string
  description: Specified columns to be made to work with UNIQUE constraint.
  - name: default_to_null
  isOptional: true
@@ -1484,7 +1484,7 @@ functions:
  description: Whether duplicate rows should be ignored.
  - name: on_conflict
  isOptional: true
- type: bool
+ type: string
  description: Specified columns to be made to work with UNIQUE constraint.
  - name: default_to_null
  isOptional: true