docs: add missing release notes to RELEASE.md

[uday-rana]

Fixes #4458. I removed the GitHub changelogs and any references to them, since the notes for the previous releases don't include them. I also added a brief release note for release 3.4rc3 which didn't have one. Please let me know if you'd like anything changed.

[terriko]

Looks like there's some names that'll need to be added to our allow list for spelling. Here's the file that needs changing:

https://github.com/intel/cve-bin-tool/blob/main/.github/actions/spelling/allow.txt

The file is in case-insensitive alphabetical order and has an extra blank line at the end. I usually just add things at the top, sort the file with my editor, then move the blank line back to the bottom. Let us know if you get stuck!

[terriko]

(See comment for requested changes for the spell checker.)

[terriko]

I'm really not sure what's up with the test failures (they seem to just be getting... cut off? aborted?) so I'm going to re-run the failing tests and see if it's a persistent problem or a transient issue with Github Actions.

[terriko]

Looks like the test failures were something on Github's end and they didn't happen when I re-ran, so we're ready to merge.

Thank you and congratulations on your first merged commit with us @uday-rana !