Remove upper constraint of setuptools_scm
Remove upper constraint of setuptools_scm

There were a temporary issue in setuptools_scm 1.15.3 [1] that broke the
world. Fortunately, it has been fixed in 1.15.4 so we are allowed to use
latest version once again.

[1] https://github.com/pypa/setuptools_scm/issues/164

ikalnytskyi/sphinxcontrib-redoc