ci: Remove weekly npm update to Dependabot

[Flash0ver]

Summary

Reverts #5028

Remarks

I added #5028 too hasty.
We cancelled #5026 and #5024, which would have added a package.json, but this approach had some security and stability concerns.

Instead, we did #5032.
And will run via #4793.

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.00%. Comparing base (715f350) to head (52949b3).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5056      +/-   ##
==========================================
+ Coverage   73.99%   74.00%   +0.01%     
==========================================
  Files         499      499              
  Lines       18067    18067              
  Branches     3519     3519              
==========================================
+ Hits        13368    13370       +2     
+ Misses       3839     3838       -1     
+ Partials      860      859       -1     

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