GCC 13s libstdc++ reduced its dependency on some headers like <cstdint>, so it's
no longer transitively included through various headers. Include it explicitly.
See also: https://gcc.gnu.org/gcc-13/porting_to.html#header-dep-changes
../lib/utils/mu-error.hh:36:26: error: ‘uint32_t’ does not name a type
36 | static constexpr uint32_t SoftError = 1 << 23;
| ^~~~~~~~
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