K2: build SAM-based function type for a given captured type properly

Before this commit, we assumed (erroneously) that a captured type
cannot have an associated SAM-based function type.
In this commit we changed this assumption, replacing a captured type
with its lower type for this purpose

#KT-63379 Fixed

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/SamResolution.kt

@@ -81,10 +81,11 @@ class FirSamResolver(
             }
 
             is ConeStubType, is ConeTypeParameterType, is ConeTypeVariableType,
-            is ConeCapturedType, is ConeDefinitelyNotNullType, is ConeIntersectionType,
-            is ConeIntegerLiteralType,
+            is ConeDefinitelyNotNullType, is ConeIntersectionType, is ConeIntegerLiteralType,
             -> null
 
+            is ConeCapturedType -> type.lowerType?.let { getFunctionTypeForPossibleSamType(it) }
+
             is ConeLookupTagBasedType -> unreachableBranch(type)
         }
     }