rel: prepare v2.8.4 release (#1382)

## Which problem is this PR solving?

- prep 2.8.4 release

## Short description of the changes

- run `make all` (we forgot to do this on the 2.8.3-release branch).
- update changelog
- update release notes

rel: Prep v2.8.2 (#1330)

Prep for release of v2.8.2

rel: Prep 2.8.1 (#1315)

Prep v2.8.1 release