WSGI Server example fails trying to import `parse_headers`

[siddacious]

>>> import server_test
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "server_test.py", line 9, in <module>
  File "adafruit_esp32spi/adafruit_esp32spi_wsgiserver.py", line 53, in <module>
ImportError: cannot import name parse_headers

there is no parse_headers in adafruit_requests, it was inlined into the body of the request method

[siddacious]

Fixed, thanks to @brentru