Restore pyroma test for iOS.

.ci/requirements-cibw.txt

@@ -1 +1 @@
-cibuildwheel==3.0.1
+cibuildwheel==3.1.2

Tests/test_pyroma.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from importlib.metadata import metadata
+
 import pytest
 
 from PIL import __version__
@@ -7,9 +9,29 @@ from PIL import __version__
 pyroma = pytest.importorskip("pyroma", reason="Pyroma not installed")
 
 
+def map_metadata_keys(metadata):
+    "Convert installed wheel metadata into canonical Core Metadata 2.4 format."
+    # This was a utility method in pyroma 4.3.3; it was removed in 5.0
+    # This implementation is constructed from the relevant logic from
+    # PyRoma 5.0's `build_metadata()` implementation.
+
+    data = {}
+    for key in set(metadata.keys()):
+        value = metadata.get_all(key)
+        key = pyroma.projectdata.normalize(key)
+
+        if len(value) == 1:
+            value = value[0]
+            if value.strip() == "UNKNOWN":
+                continue
+
+        data[key] = value
+    return data
+
+
 def test_pyroma() -> None:
     # Arrange
-    data = pyroma.projectdata.get_data(".")
+    data = map_metadata_keys(metadata("Pillow"))
 
     # Act
     rating = pyroma.ratings.rate(data)