ref: Add python_multipart to the typing group (#6729)

Add `python_multipart` to the typing dependency group and fix the resulting mypy errors.

Author: alexander-alderman-webb

pyproject.toml

@@ -68,6 +68,7 @@ typing = [
     "botocore-stubs",
     "werkzeug",
     "starlette>=1.3.1",
+    "python-multipart>=0.0.32",
 ]
 test = [
     "dataclasses ; python_full_version < '3.7'",

sentry_sdk/integrations/starlette.py

@@ -81,12 +81,12 @@
     # Optional dependency of Starlette to parse form data.
     try:
         # python-multipart 0.0.13 and later
-        import python_multipart as multipart  # type: ignore
+        import python_multipart as multipart
     except ImportError:
         # python-multipart 0.0.12 and earlier
         import multipart  # type: ignore
 except ImportError:
-    multipart = None
+    multipart = None  # type: ignore[assignment]
 
 
 # Vendored: https://github.com/Kludex/starlette/blob/0a29b5ccdcbd1285c75c4fdb5d62ae1d244a21b0/starlette/_utils.py#L11-L17