v2.2: Add serde feature to banks-interface deps (backport of #6433)

[mergify]

Problem

Publishing this crate fails because of missing features

Summary of Changes

Add serde feature to the dependencies that require it.

Required to fix CI for #6332

---

This is an automatic backport of pull request #6433 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of c098edd has failed:

On branch mergify/bp/v2.2/pr-6433
Your branch is up to date with 'origin/v2.2'.

You are currently cherry-picking commit c098eddd6.
  (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:   banks-interface/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 83.4%. Comparing base (6a90906) to head (a3c298e).
⚠️ Report is 21 commits behind head on v2.2.

Additional details and impacted files

@@           Coverage Diff           @@
##             v2.2    #6581   +/-   ##
=======================================
  Coverage    83.3%    83.4%           
=======================================
  Files         807      807           
  Lines      373498   373498           
=======================================
+ Hits       311471   311533   +62     
+ Misses      62027    61965   -62     

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