chore: Go 1.24, grpc 1.79.3, and flexible Alpine apk pins

[EnriqueL8]

Proposed changes

• Go 1.24 – Root go.mod / toolchain, manifest.json firefly-builder, and GitHub Actions setup-go use Go 1.24 so builds and images match.
• gRPC – Bump google.golang.org/grpc to v1.79.3 in the main module (transitive via migrate/viper/etc.) and Fabric sample chaincode modules to address CVE-2026-33186.
• Docker – Replace exact Alpine apk pins (=) with minimum versions (>=) on the firefly-builder and final stages so package updates (e.g. gcc 15, newer curl/git) no longer conflict with build-base / the index.

Types of changes

• Chore fix
• New feature added
• Documentation Update

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Please make sure to follow these points

• I have read the contributing guidelines.
• I have performed a self-review of my own code or work.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generates no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• My changes have sufficient code coverage (unit, integration, e2e tests).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.94%. Comparing base (0047123) to head (e0ec773).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1730   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files         342      342           
  Lines       25022    25022           
=======================================
+ Hits        25007    25008    +1     
- Misses          9       10    +1     
+ Partials        6        4    -2     

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[peterbroadhurst]

I'm was unsure we could un-pin this to at least an alpine major version, but I see it's really only last digit that changes for alpine looking at golang tags ✅