Update contributors actions materialized view

[MoralCode]

8knot updated this mat view to be more efficient:

oss-aspen/8Knot#1116

we need to upstream this into CollectOSS.

[MoralCode]

link to mat view SQL and indexes

https://github.com/oss-aspen/infra-ansible/blob/main/roles/eightknot/files/sql/explorer_contributor_actions.sql