FPM compilation fails due to new version of toml-f

[marvinfriede]

Compilation with FPM currently fails with:

./src/tblite/param/serde.f90:159:10:

  159 |    ser = toml_serializer(unit)
      |          1
Error: Component ‘output’ at (1) is a PRIVATE component of ‘toml_serializer’
<ERROR> Compilation failed for object " src_tblite_param_serde.f90.o "
<ERROR>stopping due to failed compilation
STOP 1

In FPM, the version of toml-f is not pinned. For meson and cmake, it is pinned to v0.2.4 and compilation works.
(v0.3.1 also seems to work, both build and tests. )