ci: use a smaller fixed size array for the const eval test (fixes failing windows job)

vlib/v/tests/const_eval_simple_int_expressions_at_comptime_test.v

@@ -1,18 +1,18 @@
 const kb = 1024
 
-const buf_siz = 1024 * kb
+const buf_siz = 2 * kb
 
 fn test_consts() {
 	assert kb == 1024
-	assert buf_siz == 1024 * kb
-	assert buf_siz == 1048576
+	assert buf_siz == 2 * kb
+	assert buf_siz == 2048
 	println(buf_siz)
 }
 
 fn test_fixed_size_array_can_use_a_known_comptime_const_as_its_size() {
 	buf := [buf_siz]byte{}
 	println(buf.len)
-	assert buf.len == 1048576
+	assert buf.len == 2048
 }
 
 fn test_fixed_size_array_using_a_known_int_expression_directly_as_its_size() {