fix(typing): Fix type of Metrics.set_timestamp argument (#7582)

The docstring is correct but the type hint is not.

The underlying AmazonCloudWatchEMFProvider.set_timestamp supports both
int and datetime.datetime.

Co-authored-by: Martin Kulhavy <[email protected]>
Co-authored-by: Leandro Damascena <[email protected]>

Author: 3 people

aws_lambda_powertools/metrics/metrics.py

@@ -6,6 +6,7 @@
 from aws_lambda_powertools.metrics.provider.cloudwatch_emf.cloudwatch import AmazonCloudWatchEMFProvider
 
 if TYPE_CHECKING:
+    import datetime
     from collections.abc import Callable
 
     from aws_lambda_powertools.metrics.base import MetricResolution, MetricUnit
@@ -133,7 +134,7 @@ def serialize_metric_set(
     def add_metadata(self, key: str, value: Any) -> None:
         self.provider.add_metadata(key=key, value=value)
 
-    def set_timestamp(self, timestamp: int):
+    def set_timestamp(self, timestamp: int | datetime.datetime):
         """
         Set the timestamp for the metric.