Update supported C++ standards to C++23 and C++20 (dropping C++17) #2091
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C++23 has passed all the ballots [1]. We can therefore support it now formally. This means that C++17 is no longer supported, and C++20 is supported until C++26 is released.
The primary benefit of C++23 support is that we can now use coroutines in core Seastar code, as all supported C++ versions have them.
[1] https://lists.isocpp.org/std-proposals/2024/01/8880.php