Auto merge of #121337 - ChrisDenton:ProcessPrng, r=Mark-Simulacrum

Windows: Use ProcessPrng for random keys

Windows 10 introduced [`ProcessPrng`](https://learn.microsoft.com/en-us/windows/win32/seccng/processprng) for random number generation. This allows us to replace the overly complicated (and prone to failure) `BCryptGenRandom` with a documented function.

For the tier 3 Windows 7 target, we simply use the older `RtlGenRandom`, which is undocumented. It should be fine even on modern systems (for comparability reasons) as it's just a wrapper for `ProcessPrng`. However, it does require loading an extra intermediary DLL which we can avoid when we know we have Windows 10+.

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