tests/basics: Add exp file for builtin_str_hex test.

Because bytes.hex() only supports the sep argument since Python 3.8.

Signed-off-by: Damien George <damien@micropython.org>

tests/basics/builtin_str_hex.py.exp

@@ -0,0 +1,28 @@
+0001020304050607
+0001020304050607
+0001020304050607
+00:01:02:03:04:05:06:07
+00:01:02:03:04:05:06:07
+00:01:02:03:04:05:06:07
+08090a0b0c0d0e0f
+08090a0b0c0d0e0f
+08090a0b0c0d0e0f
+08:09:0a:0b:0c:0d:0e:0f
+08:09:0a:0b:0c:0d:0e:0f
+08:09:0a:0b:0c:0d:0e:0f
+7f80ff
+7f80ff
+7f80ff
+7f:80:ff
+7f:80:ff
+7f:80:ff
+313233344142434461626364
+313233344142434461626364
+313233344142434461626364
+31:32:33:34:41:42:43:44:61:62:63:64
+31:32:33:34:41:42:43:44:61:62:63:64
+31:32:33:34:41:42:43:44:61:62:63:64
+b'\x00\x01\x02\x03\x04\x05\x06\x07'
+b'\x08\t\n\x0b\x0c\r\x0e\x0f'
+b'\x7f\x80\xff'
+b'1234ABCDabcd'