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[cmake] don't include gridformat without c++20

Mathis Kelm requested to merge fix/deps-inclusion-cpp-standard into master

What this MR does / why does DuMux need it:

The new dependency gridformat requires C++20 features. With this MR it will only be included in the build if the standard is available, allowing the submodule to be cloned regardless of build configuration.

Notes for the reviewer

TODO: insert text here

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