GOATS-689: Fix issue fetching Gemini South telescope shutter status.

[davner]

Checklist

• Added a release note in doc/changes using the PR number.

[codecov]

Codecov Report

❌ Patch coverage is 7.14286% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.34%. Comparing base (ff7b035) to head (495281d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/goats_tom/facilities/gemini.py	7.14%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #403      +/-   ##
==========================================
- Coverage   76.46%   76.34%   -0.13%     
==========================================
  Files         232      232              
  Lines        7317     7326       +9     
  Branches      454      455       +1     
==========================================
- Hits         5595     5593       -2     
- Misses       1638     1649      +11     
  Partials       84       84              

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