Move SQLFluff requirements.txt to subdirectory

[jasonaowen]

Having requirements.txt in the root of the project causes DigitalOcean App Platform to detect the app as needing the Python buildpack. Adding that buildpack seems to throw away the Node output(?), and so the migrate step fails to run:

Error: Cannot find module '/workspace/dist/scripts/migrate.js'

Even if that did not cause a build failure, we do not want this dev/CI tool to be present in the deployed image.

Move the requirements.txt file into a new subdirectory, and configure dependabot to look at that new subdirectory weekly.

Resolves #1356 Deployment failure 2024-12-03

[jasonaowen]

I was able to deploy this on api-test.pdco by editing the app spec to point to this branch rather than main, and it successfully deployed: https://cloud.digitalocean.com/apps/21057031-b8f6-4acd-a82a-912e2607e7e7/deployments/b463cb15-1ade-4b94-a48d-2dd525cfe8e3

I'll switch it back now so that it'll work when this gets merged.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.34%. Comparing base (9a871ff) to head (2fde13b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1359   +/-   ##
=======================================
  Coverage   87.34%   87.34%           
=======================================
  Files         185      185           
  Lines        2387     2387           
  Branches      321      314    -7     
=======================================
  Hits         2085     2085           
- Misses        276      302   +26     
+ Partials       26        0   -26     

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[slifty]

My initial thought was "this directory name seems too specific" but until we have another python requirement, this is truly the only thing it exists for and we can always change it another day.