Increase minimum code coverage target to 75%

Updated the `codecov.yml` configuration file to raise the
`project.default.target` value from 70% to 75%, enforcing
stricter code coverage requirements for the overall project.

codecov.yml

@@ -11,7 +11,7 @@ coverage:
     # Overall project coverage
     project:
       default:
-        target: 70%         # Minimum target coverage
+        target: 75%         # Minimum target coverage
         threshold: 1%       # Allow 1% decrease without failing
         base: auto          # Compare against base branch (v2_develop)
         if_ci_failed: error # Fail if CI fails