C++20 compatible changes

[hollowsunhc]

• Updated fmt to version 11.2.0

• spdlog had to be updated to match the updated fmt. spdlog was updated to version 1.15.2

• Replaced the removed function std::random_shuffle by std::shuffle and providing a mersenne twister as the pseudo-number generator.

The mersenne twister has better statistical properties than the internal std::rand used in std::random_shuffle but perhaps, it may have unintended negative consequences. I'm not exactly sure about the impact of such a change.

[hollowsunhc]

If reproducibility is a requirement, perhaps it is better to replace std::random_device by std::mt19937.