refactor: use guidedremediation from osv-scalibr for version updates

[cuixq]

#2675

This PR refactors the update command to use the guidedremediation package from github.com/google/osv-scalibr to handle dependency updates.

• Migrated to osv-scalibr: Replaced internal remediation/suggest and upgrade logic with guidedremediation.Update.
• Updated Snapshots: Updated the test snapshots to reflect the slightly adjusted output messages and the behavior of the suggester which prefers stable package versions.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.47%. Comparing base (800145f) to head (3de67e3).

Files with missing lines	Patch %	Lines
cmd/osv-scanner/update/command.go	83.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2719      +/-   ##
==========================================
- Coverage   71.60%   71.47%   -0.13%     
==========================================
  Files         164      164              
  Lines       12090    12075      -15     
==========================================
- Hits         8657     8631      -26     
- Misses       2805     2827      +22     
+ Partials      628      617      -11     

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[michaelkedar]

nice!