fix: use new migration gist

[maxrussell]

Test Plan

Release notes and error log in harness should link to my gist rather than Ryan's.

[netlify]

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Name	Link
🔨 Latest commit	5fd9d7a
🔍 Latest deploy log	https://app.netlify.com/sites/determined-ui/deploys/673e483b0f299b0008dfea1c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.67%. Comparing base (d189416) to head (5fd9d7a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10221      +/-   ##
==========================================
- Coverage   57.63%   53.67%   -3.97%     
==========================================
  Files         751     1255     +504     
  Lines      103234   155688   +52454     
  Branches     3617     3618       +1     
==========================================
+ Hits        59503    83561   +24058     
- Misses      43598    71994   +28396     
  Partials      133      133              

Flag	Coverage Δ
backend	45.79% <ø> (+1.99%)	⬆️
harness	67.37% <ø> (ø)
web	54.45% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
harness/determined/deploy/aws/aws.py	10.75% <ø> (ø)

... and 504 files with indirect coverage changes

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[mackrorysd]

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