Backport of upstream fix for setuptools >= 83

ref:
https://github.com/mgedmin/check-manifest/commit/5cdb776d4ad547518002ab33528b880b51378b48

diff --git a/check_manifest.py b/check_manifest.py
--- a/check_manifest.py
+++ b/check_manifest.py
@@ -592,10 +592,19 @@ class IgnoreList:
         self._regexps = []
 
     def __repr__(self):
-        return 'IgnoreList(%r)' % (self._regexps)
+        return 'IgnoreList(%r)' % (
+            [getattr(p, '_pattern', p) for p in self._regexps]
+        )
 
     def __eq__(self, other):
-        return isinstance(other, IgnoreList) and self._regexps == other._regexps
+        return (
+            isinstance(other, IgnoreList)
+            and len(self._regexps) == len(other._regexps)
+            and all(
+                getattr(a, '_pattern', a) == getattr(b, '_pattern', b)
+                for a, b in zip(self._regexps, other._regexps)
+            )
+        )
 
     def __iadd__(self, other):
         assert isinstance(other, IgnoreList)