chore(deps): update dependency imageio to v2.13.1 (GoogleCloudPlatform#7192)

Co-authored-by: Leah E. Cole <[email protected]>

Author: renovate-bot

appengine/flexible/scipy/requirements.txt

@@ -1,6 +1,6 @@
 Flask==2.0.2
 gunicorn==20.1.0
-imageio==2.10.5
+imageio==2.13.1
 numpy==1.21.4; python_version >= '3.7'
 numpy==1.19.5; python_version < '3.7'
 pillow==8.4.0