remove unused deasync dependency

[lsinger]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

Removes the deasync dependency, which seems to not be in use anymore. The package was causing a fatal build error during pnpm install when run from a path that contains spaces.

Closes #31882.

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. clone trunk into a path with spaces, run nvm use and pnpm install and notice how it fails
2. clone this branch into a path with spaces, run nvm use and pnpm install and notice how it does not fail
3. ensure the package really isn't used anymore -- I wasn't able to find any actual code reference to the string deasync, and since that is how one uses the package I assume the package isn't used anymore. please double-check this assumption.

[github-actions]

Hi @samueljseay, @peterfabian,

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions

[github-actions]

Test Results Summary

Commit SHA: b469332

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 49s
E2E Tests	187	0	0	10	0	197	14m 53s

---

To view the full API test report, click here.
To view the full E2E test report, click here.
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[samueljseay]

Nice find! Thanks for fixing this. I double checked this dep is certainly not used anywhere.

[codecov]

Codecov Report

Merging #37821 (b469332) into trunk (e8fcfbb) will decrease coverage by 0.0%.
The diff coverage is 0.0%.

Additional details and impacted files

@@            Coverage Diff             @@
##             trunk   #37821     +/-   ##
==========================================
- Coverage     51.5%    51.5%   -0.0%     
- Complexity   17261    17280     +19     
==========================================
  Files          429      430      +1     
  Lines        79957    80026     +69     
==========================================
+ Hits         41215    41216      +1     
- Misses       38742    38810     +68     

Impacted Files	Coverage Δ
...ocommerce/includes/admin/class-wc-admin-assets.php	0.0% <ø> (ø)
...eta-boxes/class-wc-meta-box-product-categories.php	0.0% <0.0%> (ø)
plugins/woocommerce/includes/class-wc-ajax.php	4.3% <0.0%> (-0.1%)	⬇️

... and 1 file with indirect coverage changes