Restrict text files with explicit line feeds to *.go.

This partially reverts b732beba. It
seems like explicitly setting all files to use line feeds was done due
to issues with the go linter, hence it can be restricted to those files
(https://github.com/ollama/ollama/pull/6235#issuecomment-2278745953).

.gitattributes

 llm/ext_server/* linguist-vendored
-* text eol=lf
-*.png binary
-*.ico binary
-*.icns binary
+* text=auto
+*.go text eol=lf