databases/mongodb40: Update to 4.0.21 (mongodb40-tools also)
- Pretty trivial version update.
- Point www to manual of 4.0.
- Update CONFLICTS_INSTALL. (I don't see how -tools conflicted with mongodb.)
Changelog:
https://docs.mongodb.com/manual/release-notes/4.0/#aug-21-2020
https://docs.mongodb.com/manual/release-notes/4.0/#nov-10-2020
PR: 250156
Submitted by: Ronald Klop (maintainer)
Approved by: dev.ashevchuk@gmail.com (maintainer timeout)