Fix infinite loop when requesting too quickly

On the Pico W we can get in an infinite loop if we request pages too quickly. This is because we get an OSError 32 Broken Pipe back from which we can't recover.
I've made it so any of the unexpected errors will be re-raised.

Fixes this issue:
#44

Author: foxy82

adafruit_httpserver/response.py

@@ -245,5 +245,7 @@ def _send_bytes(
             except OSError as exc:
                 if exc.errno == EAGAIN:
                     continue
-                if exc.errno == ECONNRESET:
+                elif exc.errno == ECONNRESET:
                     return
+                else:
+                    raise exc