Merge pull request #725 from maxking/dependabot/pip/core/mailman-3.3.10

Bump mailman from 3.3.9 to 3.3.10 in /core

Author: maxking

core/requirements.txt

@@ -1,5 +1,5 @@
 # This is a separate file from Dockerfile so that we can use dependabot
 # for version updates that isn't supported for contents inside the
 # Dockerfile.
-mailman==3.3.9
+mailman==3.3.10
 mailman-hyperkitty==1.2.1