app/version: bump v1.8 to stable

[obol-platform]

This pull request was automatically generated by the 'Prepare Minor Full Release' GitHub Action.

• Release Branch: main-v1.8
• Stable Version: v1.8

Changes

• Updated version in app/version/version.go from v1.8-rc to v1.8

Next Steps

1. Review and merge this PR
2. After merge, proceed with "Tag Minor Full Release" workflow to create and push the tag v1.8.0
3. A separate PR has been created to bump main to v1.9-dev

category: misc
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.31%. Comparing base (6d90088) to head (d09ba0c).
⚠️ Report is 1 commits behind head on main-v1.8.

Additional details and impacted files

@@              Coverage Diff              @@
##           main-v1.8    #4191      +/-   ##
=============================================
- Coverage      56.33%   56.31%   -0.02%     
=============================================
  Files            245      245              
  Lines          31272    31272              
=============================================
- Hits           17616    17610       -6     
- Misses         11342    11347       +5     
- Partials        2314     2315       +1     

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