port to latest zig fs api

src/main.zig

@@ -89,9 +89,9 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: anytype) !void {
         file_read.close();
     }
 
-    var file = try std.fs.cwd().openFile(scri_path, .{
-        .write = true,
+    var file = try std.fs.cwd().createFile(scri_path, .{
         .read = false,
+        .truncate = true,
     });
     defer file.close();