Running tests via lldb on linux musl hangs in CI

[dipinhora]

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As seen as part of https://github.com/ponylang/ponyc/pull/4164, when tests are run using lldb for x86-64-unknown-linux-musl, it results in them hanging and the CI run timing out. The same doesn't occur with gdb. This may or may not be reproducible outside of the CI environment.