chore(deps): update dependency imageio to v2.13.2 (GoogleCloudPlatform#7205)

Author: renovate-bot

appengine/flexible/scipy/requirements.txt

@@ -1,6 +1,6 @@
 Flask==2.0.2
 gunicorn==20.1.0
-imageio==2.13.1
+imageio==2.13.2
 numpy==1.21.4; python_version >= '3.7'
 numpy==1.19.5; python_version < '3.7'
 pillow==8.4.0