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
11:16.32 .../components/telemetry/pingsender/pingsender.cpp:30:7:
error: unknown type name 'uint32_t'
11:16.33 const uint32_t kConnectionTimeoutMs = 30 * 1000;
11:16.33 ^
11:16.33 ... /components/telemetry/pingsender/pingsender.cpp:76:9:
error: unknown type name 'uint32_t'
11:16.33 const uint32_t kBufferSize = 4 * 1024 - 1;
11:16.34 ^
11:16.44 2 errors generated.
(et al)
Differential Revision: https://phabricator.services.mozilla.com/D167491
55b688775f