fix(bun): resolve internal dependencies with bun export condition

[pi0]

🔗 Linked issue

❓ Type of change

Currently bun preset is broken since after unjs/ofetch#246, unjs/node-fetch-native#75 and unjs/uncrypto@abf5508, new bun export condition is used but we still trace the externals of ofetch/node-fetch-native/uncrypto with node condition.

This PR uses a workaround to resolve this.

• 📖 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

📝 Checklist

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

[codecov]

Codecov Report

Merging #1313 (43719b0) into main (1a497c4) will increase coverage by 0.03%.
The diff coverage is 93.82%.

@@            Coverage Diff             @@
##             main    #1313      +/-   ##
==========================================
+ Coverage   76.89%   76.93%   +0.03%     
==========================================
  Files          68       68              
  Lines        6829     6845      +16     
  Branches      693      685       -8     
==========================================
+ Hits         5251     5266      +15     
  Misses       1577     1577              
- Partials        1        2       +1     

Impacted Files	Coverage Δ
src/presets/netlify.ts	77.97% <66.66%> (ø)
src/presets/vercel.ts	94.03% <75.00%> (ø)
src/build.ts	85.12% <84.61%> (-0.10%)	⬇️
src/rollup/config.ts	88.67% <97.50%> (-0.92%)	⬇️
src/options.ts	94.33% <100.00%> (+0.01%)	⬆️
src/presets/bun.ts	100.00% <100.00%> (ø)
src/types/nitro.ts	100.00% <100.00%> (ø)
src/utils/index.ts	74.02% <100.00%> (ø)

... and 1 file with indirect coverage changes