app/version: bump v1.9 to stable

[obol-platform]

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

• Release Branch: main-v1.9
• Stable Version: v1.9

Changes

• Updated version in app/version/version.go from v1.9-rc to v1.9

Next Steps

1. Review and merge this PR
2. After merge, proceed with "Tag Minor Full Release" workflow to create and push the tag v1.9.0
3. A separate PR has been created to bump main to v1.10-dev

category: misc
ticket: none

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.40%. Comparing base (94ca685) to head (621f689).
⚠️ Report is 1 commits behind head on main-v1.9.

Additional details and impacted files

@@              Coverage Diff              @@
##           main-v1.9    #4335      +/-   ##
=============================================
+ Coverage      56.37%   56.40%   +0.02%     
=============================================
  Files            237      237              
  Lines          31696    31696              
=============================================
+ Hits           17868    17877       +9     
+ Misses         11539    11532       -7     
+ Partials        2289     2287       -2     

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[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