chore(deps): update dependency eventlet to v0.31.0 (GoogleCloudPlatform#6006)

Author: renovate-bot

composer/workflows/constraints.txt

@@ -188,7 +188,7 @@ elasticsearch-dsl==7.3.0
 elasticsearch==7.13.0
 email-validator==1.1.2
 entrypoints==0.3
-eventlet==0.30.1
+eventlet==0.31.0
 execnet==1.8.1
 facebook-business==9.0.3
 fastavro==1.3.1