python3.pkgs.pythonRuntimeDepsCheckHook: allow prereleases

Updating to prereleases should be possible, but making this an option is
difficult, given that for packages with many consumers you would have to
set it in each consumer.

We thoroughly test the package set, so allowing prereleases unconditionally
shouldn't be too bad.

Closes: #301698

pkgs/development/interpreters/python/hooks/python-runtime-deps-check-hook.py

···
         error(f"{package_name} not installed")
         return False
 
+    # Allow prereleases, to give to give us some wiggle-room
+    requirement.specifier.prereleases = True
+
     if requirement.specifier and package.version not in requirement.specifier:
         error(
             f"{package_name}{requirement.specifier} not satisfied by version {package.version}"