[Bug] String Type random test is flaky

[vicsn]

🐛 Bug Report

Steps to Reproduce

cd console/types/string && cargo test test_random
Change ITERATIONS to 1000 to make it very likely.

Expected Behavior

The test should only fail with negligible probability.

Your Environment

snarkVM v0.16.15
cargo 1.71.1
macOS

[ljedrz]

Cc https://github.com/AleoHQ/snarkVM/issues/986