gh-140381: Increase slow_fibonacci call frequency in test_profiling #140673
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Fixes #140381
Problem
Tests asserting "slow_fibonacci" in test_profiling were flaky on slower architectures (i686/s390x) because the function wasn't called frequently enough for the profiler to reliably capture it.
Solution
Changed slow_fibonacci to run every 2nd iteration instead of every 5th iteration, increasing its call frequency from 20% to 50% of iterations.
Testing
This should resolve the flaky test failures on i686/s390x builds.
test_profilingflaky fail on i686/s390x builds in Fedora Linux #140381