Merge bitcoin/bitcoin#31691: util: fix compiler warning about deprecated space before _MiB

d3339a7cd5f10e8a6b2a6c64daa66cd71a3e81d3 util: fix compiler warning about deprecated space before _MiB (Vasil Dimov)

Pull request description:

  ```
  src/util/byte_units.h:13:29: error: identifier '_MiB' preceded by whitespace in a literal operator declaration is deprecated [-Werror,-Wdeprecated-literal-operator]
     13 | constexpr size_t operator"" _MiB(unsigned long long mebibytes)
        |                  ~~~~~~~~~~~^~~~
        |                  operator""_MiB
  1 error generated.
  ```

  Clang 20.0.0

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merge-script 2025-01-20 14:09:01 +00:00
commit 4e52a63443
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@ -10,7 +10,7 @@
#include <stdexcept>
//! Overflow-safe conversion of MiB to bytes.
constexpr size_t operator"" _MiB(unsigned long long mebibytes)
constexpr size_t operator""_MiB(unsigned long long mebibytes)
{
auto bytes{CheckedLeftShift(mebibytes, 20)};
if (!bytes || *bytes > std::numeric_limits<size_t>::max()) {