test(lock): fix SetMax test range

[SSOHEB]

What does this PR do?

Fixes the TestSetMax test in lock/semaphore_test.go.

The test defines an explicit sequence of values:

3, 2, 1, 0, -1, 0, 1, 2, 3

but uses a single variable range, which iterates over the slice indices rather than its values. As a result, the test actually passes 0, 1, 2, 3, 4, 5, 6, 7, 8 to SetMax() and never exercises the intended negative or decreasing values.

This changes the loop to use for _, i := range ..., so the test actually exercises the values it defines.

Testing

• go test ./lock
• git diff --check

All tests pass.

• Changelog entries added in the respective changelog/ directory (user-facing change, bug fix, security fix, update)
• Inspected CI output for image differences: /boot and /usr size, packages, list files for any missing binaries, kernel modules, config files, kernel modules, etc.