Fix .gitattributes to correctly handle binary files (#2839)

<!-- Reference any GitHub issues resolved by this PR -->

Closes #

Binary files should be excluded from line-ending normalization. In the
current state, git is trying to normalize binary files that do not have
eol char (and never had). This causes a newly cloned repo to have all
binary files unstaged with warning `CRLF will be replaced by LF the next
time Git touches it`. It may cause confusion in the upcoming hackathon.

## Introduced changes

<!-- A brief description of the changes -->

-

## Checklist

<!-- Make sure all of these are complete -->

- [x] Linked relevant issue
- [x] Updated relevant documentation
- [x] Added relevant tests
- [x] Performed self-review of the code
- [x] Added changes to `CHANGELOG.md`

Author: kkawula

.gitattributes

@@ -1 +1,4 @@
 *.* text eol=lf
+*.png -text
+*.jpg -text
+*.gif -text