Remove deprecated boto3 parameter (#2443)

SUMMARY
Since we dropped support for the old boto SDK (#630) the boto3 parameter for get_aws_region() and get_aws_connection_info() has done nothing.  This finally removes the parameter (deprecated #2047)
ISSUE TYPE

Feature Pull Request

COMPONENT NAME
plugins/module_utils/botocore.py
ADDITIONAL INFORMATION

Reviewed-by: Bikouo Aubin
Reviewed-by: Alina Buzachis

changelogs/fragments/2443-boto-final-clean.yml

@@ -0,0 +1,3 @@
+---
+breaking_changes:
+  - module_utils.botocore - drop deprecated ``boto3`` parameter for ``get_aws_region()`` and ``get_aws_connection_info()``, this parameter has had no effect since release 4.0.0 (https://github.com/ansible-collections/amazon.aws/pull/2443).

plugins/module_utils/botocore.py

@@ -228,15 +228,7 @@ def _aws_region(params: Dict) -> Optional[str]:
 
 def get_aws_region(
     module: AnsibleAWSModule,
-    boto3: Optional[bool] = None,
 ) -> Optional[str]:  # pylint: disable=redefined-outer-name
-    if boto3 is not None:
-        module.deprecate(
-            "get_aws_region(): the boto3 parameter will be removed in a release after 2025-05-01. "
-            "The parameter has been ignored since release 4.0.0.",
-            date="2025-05-01",
-            collection_name="amazon.aws",
-        )
     try:
         return _aws_region(module.params)
     except AnsibleBotocoreError as e:
@@ -302,15 +294,7 @@ def _aws_connection_info(params: Dict) -> Tuple[Optional[str], Optional[str], Di
 
 def get_aws_connection_info(
     module: AnsibleAWSModule,
-    boto3: Optional[bool] = None,
 ) -> Tuple[Optional[str], Optional[str], Dict]:  # pylint: disable=redefined-outer-name
-    if boto3 is not None:
-        module.deprecate(
-            "get_aws_connection_info(): the boto3 parameter will be removed in a release after 2025-05-01. "
-            "The parameter has been ignored since release 4.0.0.",
-            date="2025-05-01",
-            collection_name="amazon.aws",
-        )
     try:
         return _aws_connection_info(module.params)
     except AnsibleBotocoreError as e: