xGEDMD(Q): silence warning with 64-bit integers

[christoph-conrads]

Fix the following warning by GCC 12.2.0 when building with 64-bit integers (e.g., when BUILD_INDEX64_EXT_API=ON):

Warning: Use of the NUMERIC_STORAGE_SIZE named constant from intrinsic module ISO_FORTRAN_ENV at (1) is incompatible with option -fdefault-integer-8

References:

• Stack Overflow thread _ISO_FORTRANENV or -fdefault-real-8 to promote reals to double precision

Checklist

• [x] The documentation has been updated.
• [x] If the PR solves a specific issue, it is set to be closed on merge.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (fe843f9) to head (e02fbda).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #993 +/- ## ======================================= Coverage 0.00% 0.00% ======================================= Files 1929 1929 Lines 190635 190635 ======================================= Misses 190635 190635 ```

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