py/objarray: Detect bytearray(str) without an encoding.

This prevents a very subtle bug caused by writing e.g. `bytearray('\xfd')`
which gives you `(0xc3, 0xbd)`.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/basics/bytearray_construct.py

@@ -5,3 +5,8 @@ print(bytearray('1234', 'utf-8'))
 print(bytearray('12345', 'utf-8', 'strict'))
 print(bytearray((1, 2)))
 print(bytearray([1, 2]))
+
+try:
+    print(bytearray('1234'))
+except TypeError:
+    print("TypeError")