Update RSPAMD version to 4.0.1 in Dockerfile

[dragoangel]

Contribution Guidelines

• I've read the contribution guidelines and wholeheartedly agree them

What does this PR include?

Short Description

Update Rspamd to 4.0.1 version, changelog

Affected Containers

• rspamd

Did you run tests?

no

What did you tested?

What were the final results? (Awaited, got)

[dragoangel]

@FreddleSpl0it JFYI meta_headers was deprecated in 3.14.2
https://github.com/mailcow/mailcow-dockerized/blob/staging/data/conf/rspamd/local.d/metadata_exporter.conf need to drop meta_headers = true; and use formatter = "multipart"; as result
https://github.com/mailcow/mailcow-dockerized/tree/master/data/conf/rspamd/meta_exporter PHP endpoints need to be rewritten to be compatible with new multipart format, Docs

Reason why it deprecated: it pass value in headers that can be non-ASCII only, and worse - on long subjects it was apply mime-encode which basically create "binary" newlines for long headers which not possible to handle by any server, as result - it can lead to lost emails in quarantine or avoid of outgoing ratelimiting etc.

Also:

• we can add fuzzy new html fuzzy
• we can add tcp to mailcow public fuzzy
• due to introduction of better jinja templating it's now possible to simplify or fully remove entry point of rspamd container and replace it with templating