Changed allow_headers to * (#231)

Closes #228 

No real way to pytest this, but Sigmund tested in AWS after I patched
the image with this prior to the story.

src/sbl_filing_api/main.py

@@ -66,7 +66,7 @@ def run_migrations():
     CORSMiddleware,
     allow_origins=["*"],
     allow_methods=["*"],
-    allow_headers=["authorization"],
+    allow_headers=["*"],
 )