v2.3: Add feature to svm deps (backport of #6440)

[mergify]

Problem

Publishing this crate fails because of missing features

Summary of Changes

Add debug-signature feature to the dependencies that require it.

Required to fix CI for #6332

---

This is an automatic backport of pull request #6440 done by Mergify.

[mergify]

Cherry-pick of b22b23f has failed:

On branch mergify/bp/v2.3/pr-6440
Your branch is up to date with 'origin/v2.3'.

You are currently cherry-picking commit b22b23f1d.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   svm/Cargo.toml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.8%. Comparing base (14a02a2) to head (88cf26f).

Additional details and impacted files

@@            Coverage Diff            @@
##             v2.3    #6518     +/-   ##
=========================================
- Coverage    82.8%    82.8%   -0.1%     
=========================================
  Files         848      848             
  Lines      379532   379532             
=========================================
- Hits       314508   314384    -124     
- Misses      65024    65148    +124     

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[steviez]

I did the rebase but this one is so minor that I don't feel bad being the second