[python] PY-81424 update message for keyword unpack inspection

GitOrigin-RevId: 24234b4936031a19d08f58fbf871bc1749853745

python/python-psi-impl/resources/messages/PyPsiBundle.properties

@@ -572,7 +572,7 @@ INSP.parameter(s).unfilled=Parameter(s) unfilled
 INSP.incorrect.arguments=Incorrect argument(s)
 INSP.possible.callees=Possible callees
 INSP.function.lacks.positional.argument=Function ''{0}'' lacks a positional argument
-INSP.expected.dict.got.type=Expected a dictionary, got {0}
+INSP.expected.dict.got.type=Expected a mapping, got {0}
 INSP.expected.iterable.got.type=Expected an iterable, got {0}
 
 # PyMethodParametersInspection

python/python-psi-impl/src/com/jetbrains/python/inspections/PyArgumentListInspection.java

@@ -201,6 +201,7 @@ public final class PyArgumentListInspection extends PyInspection {
           if (inside_type != null && !PyTypeChecker.isUnknown(inside_type, context)) {
             if (((PyStarArgument)arg).isKeyword()) {
               if (!PyABCUtil.isSubtype(inside_type, PyNames.MAPPING, context)) {
+                // TODO: check that the key type is compatible with `str`
                 holder.registerProblem(arg, PyPsiBundle.message("INSP.expected.dict.got.type", inside_type.getName()));
               }
             }

python/testSrc/com/jetbrains/python/inspections/Py3ArgumentListInspectionTest.java

@@ -476,4 +476,16 @@ public class Py3ArgumentListInspectionTest extends PyInspectionTestCase {
                    c = MyClass(1)
                    """);
   }
+
+  public void testKeywordUnpack() {
+    doTestByText("""
+                   from collections.abc import Mapping
+                   
+                   class M(Mapping[str, str]): pass
+                   
+                   dict(**M())
+                   
+                   dict(<warning descr="Expected a mapping, got int">**1</warning>)
+                   """);
+  }
 }