update .gitignore

The old lines would consider the folder itself as not ignored. This confuses editors like VS Code which highlight the directory itself as untracked.

Author: Techatrix

.gitignore

@@ -1,3 +1,3 @@
-zig-out/**
-zig-cache/**
-.zig-cache/**
+zig-out
+zig-cache
+.zig-cache