FIX: switch back to python-constraint

.constraints/py3.10.txt

@@ -121,7 +121,7 @@ pytest==8.3.2
 pytest-cov==5.0.0
 pytest-profiling==1.7.0
 pytest-xdist==3.6.1
-python-constraint2==2.0.0b5
+python-constraint==1.4.0
 python-dateutil==2.9.0.post0
 python-json-logger==2.0.7
 python-lsp-jsonrpc==1.1.2

.constraints/py3.11.txt

@@ -120,7 +120,7 @@ pytest==8.3.2
 pytest-cov==5.0.0
 pytest-profiling==1.7.0
 pytest-xdist==3.6.1
-python-constraint2==2.0.0b5
+python-constraint==1.4.0
 python-dateutil==2.9.0.post0
 python-json-logger==2.0.7
 python-lsp-jsonrpc==1.1.2

.constraints/py3.12.txt

@@ -120,7 +120,7 @@ pytest==8.3.2
 pytest-cov==5.0.0
 pytest-profiling==1.7.0
 pytest-xdist==3.6.1
-python-constraint2==2.0.0b5
+python-constraint==1.4.0
 python-dateutil==2.9.0.post0
 python-json-logger==2.0.7
 python-lsp-jsonrpc==1.1.2

.constraints/py3.8.txt

@@ -126,7 +126,7 @@ pytest==8.3.2
 pytest-cov==5.0.0
 pytest-profiling==1.7.0
 pytest-xdist==3.6.1
-python-constraint2==2.0.0b5
+python-constraint==1.4.0
 python-dateutil==2.9.0.post0
 python-json-logger==2.0.7
 python-lsp-jsonrpc==1.1.2

.constraints/py3.9.txt

@@ -121,7 +121,7 @@ pytest==8.3.2
 pytest-cov==5.0.0
 pytest-profiling==1.7.0
 pytest-xdist==3.6.1
-python-constraint2==2.0.0b5
+python-constraint==1.4.0
 python-dateutil==2.9.0.post0
 python-json-logger==2.0.7
 python-lsp-jsonrpc==1.1.2

pyproject.toml

@@ -31,9 +31,8 @@ dependencies = [
     "attrs >=20.1.0", # on_setattr and https://www.attrs.org/en/stable/api.html#next-gen
     "jsonschema",
     "particle",
+    "python-constraint",
     "tqdm >=4.24.0", # autonotebook
-    'python-constraint2; python_version >="3.8.0"',
-    'python-constraint; python_version <"3.8.0"',
     'typing-extensions; python_version <"3.8.0"', # Literal, Protocol
 ]
 description = "Rule-based particle reaction problem solver on a quantum number level"