ci/pr: lock msrv deps versions

[tzemanovic]

Describe your changes

fix the failing CI job to lock deps versions as one of the new ones requires rust edition2024

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 74.53%. Comparing base (f037759) to head (7ca07c9).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4420   +/-   ##
=======================================
  Coverage   74.53%   74.53%           
=======================================
  Files         339      339           
  Lines      110504   110504           
=======================================
+ Hits        82359    82368    +9     
+ Misses      28145    28136    -9     

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