fix apps version fallback

[tzemanovic]

Describe your changes

When there's no .git dir the build script falls back to get the version string from cargo. This should use the metadata of the apps crate, but instead it was using the workspace version, which contains version used for libs.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.59%. Comparing base (db1e36e) to head (5bc357c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4224      +/-   ##
==========================================
- Coverage   74.59%   74.59%   -0.01%     
==========================================
  Files         342      342              
  Lines      108724   108724              
==========================================
- Hits        81102    81099       -3     
- Misses      27622    27625       +3     

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