fix: Move class attribute warnings from constructor to setter

Signed-off-by: Souta Kawahara <souta.kawahara@almalinux.org>

Author: KAWAHARA-souta

cyclonedx/model/bom.py

@@ -87,13 +87,7 @@ def __init__(
         self.properties = properties or []
         self.manufacturer = manufacturer
         self.lifecycles = lifecycles or []
-
         self.manufacture = manufacture
-        if manufacture:
-            warn(
-                '`bom.metadata.manufacture` is deprecated from CycloneDX v1.6 onwards. '
-                'Please use `bom.metadata.component.manufacturer` instead.',
-                DeprecationWarning)
 
     @property
     @serializable.type_mapping(serializable.helpers.XsdDateTime)
@@ -214,6 +208,11 @@ def manufacture(self, manufacture: Optional[OrganizationalEntity]) -> None:
         @todo Based on https://github.com/CycloneDX/specification/issues/346,
               we should set this data on `.component.manufacturer`.
         """
+        if manufacture:
+            warn(
+                '`bom.metadata.manufacture` is deprecated from CycloneDX v1.6 onwards. '
+                'Please use `bom.metadata.component.manufacturer` instead.',
+                DeprecationWarning)
         self._manufacture = manufacture
 
     @property

cyclonedx/model/component.py

@@ -1035,12 +1035,6 @@ def __init__(
         self.crypto_properties = crypto_properties
         self.tags = tags or []
 
-        if modified:
-            warn('`.component.modified` is deprecated from CycloneDX v1.3 onwards. '
-                 'Please use `@.pedigree` instead.', DeprecationWarning)
-        if author:
-            warn('`.component.author` is deprecated from CycloneDX v1.6 onwards. '
-                 'Please use `@.authors` or `@.manufacturer` instead.', DeprecationWarning)
 
     @property
     @serializable.type_mapping(_ComponentTypeSerializationHelper)
@@ -1175,6 +1169,9 @@ def author(self) -> Optional[str]:
 
     @author.setter
     def author(self, author: Optional[str]) -> None:
+        if author:
+            warn('`.component.author` is deprecated from CycloneDX v1.6 onwards. '
+                 'Please use `@.authors` or `@.manufacturer` instead.', DeprecationWarning)
         self._author = author
 
     @property
@@ -1450,6 +1447,9 @@ def modified(self) -> bool:
 
     @modified.setter
     def modified(self, modified: bool) -> None:
+        if modified:
+            warn('`.component.modified` is deprecated from CycloneDX v1.3 onwards. '
+                 'Please use `@.pedigree` instead.', DeprecationWarning)
         self._modified = modified
 
     @property