Bump Python requirement imageio to 2.29.0

requirements.txt

@@ -2,7 +2,7 @@ arkindex-export==0.1.3
 boto3==1.26.124
 editdistance==0.6.2
 fontTools==4.39.3
-imageio==2.26.1
+imageio==2.29.0
 mlflow-skinny==2.2.2
 networkx==3.1
 numpy==1.24.3