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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

Before you request a review from someone, make sure to revise the following points:

  • does the new code follow the style guide?
  • do the test pipelines pass? (see guide on how to run pipelines for a merge request)
  • is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
  • does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in CHANGELOG.md.
  • is the list of the header includes complete? ("include what you use")
  • all files have to end with a \n character. Make sure there is no \ No newline at end of file comment in "Changes" of this MR.

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