Everywhere: Use east const in more places

These changes are compatible with clang-format 16 and will be mandatory
when we eventually bump clang-format version. So, since there are no
real downsides, let's commit them now.

Kernel/Devices/SerialDevice.cpp

@@ -57,7 +57,7 @@ ErrorOr<size_t> SerialDevice::write(OpenFileDescription& description, u64, UserO
         return EAGAIN;
 
     return buffer.read_buffered<128>(size, [&](ReadonlyBytes bytes) {
-        for (const auto& byte : bytes)
+        for (auto const& byte : bytes)
             put_char(byte);
         return bytes.size();
     });