[Debian-med-packaging] Bug#1087508: spdlog not useable in Trixie at the moment

[Dietmar Czekay]

https://github.com/gabime/spdlog/pull/3332 says for spdlogv1.15.1 fmt 
11.1.3 is needed.

I'm getting the following

error: ‘basic_runtime’ is not a member of ‘fmt’
   168 |           std::is_convertible<T, 
fmt::basic_string_view<Char>>::value || std::is_same<remove_cvref_t<T>, 
fmt::basic_runtime<Char>>::value>

compiling a program using spdlog 1.15.1 in sid

Dietmar