Update starlette dependency to avoid CVE-2026-48710

[rtuck99]

Constrains starlette to >= 1.1.0 which is a transitive dependency via fastapi to address CVE-2026-48710

(remember to update pyproject.toml with the dodal commit tag if you need it for tests to pass!)

Instructions to reviewer on how to test:

1. Do thing x
2. Confirm thing y happens

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[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.01%. Comparing base (912ef5e) to head (d80e067).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1757   +/-   ##
=======================================
  Coverage   93.01%   93.01%           
=======================================
  Files         164      164           
  Lines        8909     8909           
=======================================
  Hits         8287     8287           
  Misses        622      622           

Components	Coverage Δ
i24 SSX	77.15% <ø> (ø)
hyperion	98.73% <ø> (ø)
other	98.16% <ø> (ø)

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