fix: mark PIDFDInfo and PIDRUsage unsafe #145
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This patch marks the PIDRUsage and PIDFDInfo traits as unsafe, since incorrect implementations of
these traits could lead to unsound behavior.
Unfortunately, since these are public traits,
this will mean an incompatible version bump
for the next release, though hopefully no one
is really rolling their own implementation for
these guys.
https://doc.rust-lang.org/reference/unsafe-keyword.html#unsafe-traits-unsafe-trait