ci: cleanup .gitattributes, runes.txt and input_rune_iterator_test.v

.gitattributes

@@ -8,4 +8,3 @@ v.mod linguist-language=V
 .vdocignore linguist-language=ignore
 
 Dockerfile.* linguist-language=Dockerfile
-vlib/v/tests/runes.txt binary

vlib/builtin/input_rune_iterator_test.v

@@ -1,4 +1,5 @@
 // vtest build: !windows
+// vtest retry: 2
 import os
 import time
 

vlib/v/tests/runes.txt

@@ -1 +0,0 @@
-Проба Abc 你好 🌍 123