Update server.py

Ensure unexpected OSError isn't swallowed.

Author: foxy82

adafruit_httpserver/server.py

@@ -104,6 +104,7 @@ def _receive_header_bytes(
             except OSError as ex:
                 if ex.errno == ETIMEDOUT:
                     break
+                raise
             except Exception as ex:
                 raise ex
         return received_bytes
@@ -122,6 +123,7 @@ def _receive_body_bytes(
             except OSError as ex:
                 if ex.errno == ETIMEDOUT:
                     break
+                raise
             except Exception as ex:
                 raise ex
         return received_body_bytes[:content_length]