docs: fix fastapi ext demo

[jseguillon]

Description

Fix fastapi ext demo:

@@ -47,7 +47,7 @@ class RawEventModel(BaseModel):
 
 class User(BaseModel):
     id: int
-    name = 'Jane Doe'
+    name: str
 

With current demo, pydantic fails with "A non-annotated attribute was detected" as described in issue ref

Issue reference

#775

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.40%. Comparing base (bffb749) to head (c45c233).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #776      +/-   ##
==========================================
- Coverage   86.63%   86.40%   -0.23%     
==========================================
  Files          84       89       +5     
  Lines        4473     5106     +633     
==========================================
+ Hits         3875     4412     +537     
- Misses        598      694      +96     

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[dapr-bot]

This pull request has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!