feat: allow panphon 0.21 where possible

And make the unit test accept 0.21 and older versions.

Fixes #388

g2p/tests/test_fallback.py

@@ -72,16 +72,20 @@ def test_mapping(self):
             ],
         )
         test_ipa = align_to_dummy_fallback(ipa_mapping, "out", quiet=True)
-        self.assertEqual(
-            test_ipa.rules,
-            [
-                Rule(rule_input="æ", rule_output="ɑ", match_pattern="æ"),
-                Rule(rule_input="ɐ", rule_output="ɑ", match_pattern="ɐ"),
-                Rule(rule_input="ɑ̃", rule_output="ɑ", match_pattern="ɑ̃"),
-                Rule(rule_input="β", rule_output="s", match_pattern="β"),
-                Rule(rule_input="ɡ", rule_output="t", match_pattern="ɡ"),
-            ],
-        )
+        panphon_021_ref = [
+            Rule(rule_input="æ", rule_output="ɑ", match_pattern="æ"),
+            Rule(rule_input="ɐ", rule_output="i", match_pattern="ɐ"),
+            Rule(rule_input="ɑ̃", rule_output="ɑ", match_pattern="ɑ̃"),
+            Rule(rule_input="β", rule_output="s", match_pattern="β"),
+            Rule(rule_input="ɡ", rule_output="t", match_pattern="ɡ"),
+        ]
+        panphon_020_ref = [
+            panphon_021_ref[0],
+            Rule(rule_input="ɐ", rule_output="ɑ", match_pattern="ɐ"),
+            *panphon_021_ref[2:],
+        ]
+        if test_ipa.rules != panphon_021_ref:
+            self.assertEqual(test_ipa.rules, panphon_020_ref)
 
 
 if __name__ == "__main__":

pyproject.toml

@@ -22,7 +22,9 @@ dependencies = [
     "coloredlogs>=15.0.1",
     "networkx>=2.6",
     "openpyxl",
-    "panphon>=0.19,<0.21",
+    "panphon>=0.19",
+    "panphon<0.21; python_version<'3.9'",
+    "panphon<0.21; platform_system=='Windows'",
     "pydantic>=2.4",
     "pyyaml>=5.2",
     "regex",

requirements.txt

@@ -63,7 +63,7 @@ openpyxl==3.1.2
     # via hatch.envs.prod
 packaging==24.0
     # via gunicorn
-panphon==0.20.0
+panphon==0.21.2
     # via hatch.envs.prod
 pydantic==2.6.4
     # via