Add missing <vector> include in libdispatch_queue.hpp

[mikomikotaishi]

exec/libdispatch_queue.hpp uses std::vector (line 443 upstream, line 444 after my edits), but never includes <vector>. Although this typically arrives transitively through stdexec/execution.hpp, on libc++ 22, the include appears on C++23 but does not in C++26. stdexec/execution.hpp already includes the other std symbols used in this file transitively, but not std::vector.

#include<exec/libdispatch_queue.hpp>intmain() {
return0;
}

Result:

$ clang++ -std=c++2c -stdlib=libc++ -I include -fsyntax-only Test.cppexec/libdispatch_queue:443:12: error: no template named 'vector' in namespace 'std'

This, however, passes with -std=c++23.

This header only gets included on Apple platforms, and Linux/libstdc++ never compiles it. (I observed this on Homebrew LLVM clang 22.1.8 and bundled libc++, on macOS.)

The fix is simply adding #include <vector>.

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[ericniebler]

/ok to test 858e4f1