fix: sort aliases to ensure priority is given to more specific aliases

[danielroe]

🔗 Linked issue

resolves #378, see also unjs/unenv#45

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

A couple of issues have come up recently about alias ordering. This PR applies a fix to order aliases by specificity (e.g. number of slashes) meaning we should always have more specific alias in front of general (fs/promises in front of fs).

The upstream PR to unenv resolves it more specifically within the unenv presets but this is still worth merging here as there are other potential aliases involved.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #388 (1be0b12) into main (09032a0) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##             main     #388   +/-   ##
=======================================
  Coverage   55.95%   55.96%           
=======================================
  Files          54       54           
  Lines        3467     3472    +5     
  Branches      362      364    +2     
=======================================
+ Hits         1940     1943    +3     
  Misses       1178     1178           
- Partials      349      351    +2     

Impacted Files	Coverage Δ
src/utils/index.ts	24.34% <50.00%> (+1.21%)	⬆️

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