Fix the pefile dependency version

The next release of pefile will not be compatible due to
erocarrera/pefile@380635b.
Fixing the dependency version avoids breakage in the interim before
delvewheel is updated.

setup.cfg

@@ -33,7 +33,7 @@ project_urls =
 [options]
 packages = delvewheel
 install_requires =
-    pefile
+    pefile == 2023.2.7
 python_requires = >= 3.7
 
 [options.entry_points]