Update the downgrade action and fix bounds

[sethaxen]

Due to some change in some dependency, the downgrade workflow now fails. This PR updates to the latest version of the workflow and plays with version bounds to make it pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.68%. Comparing base (04d44cb) to head (00e13c4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #129      +/-   ##
==========================================
- Coverage   96.68%   96.68%   -0.01%     
==========================================
  Files          11       10       -1     
  Lines         876      875       -1     
==========================================
- Hits          847      846       -1     
  Misses         29       29              

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[coveralls]

Pull Request Test Coverage Report for Build 11881405714

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 96.686%

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Files with Coverage Reduction	New Missed Lines	%
src/rstar.jl	1	98.46%

Totals
Change from base Build 9928519803:	0.1%
Covered Lines:	846
Relevant Lines:	875

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💛 - Coveralls