Add ENOTCONN to errno

ENOTCONN seems to be present in core micropython (v1.24.1), at least on my unix build, but not here – installing `errno` via `mip` resulted in me being unable to import it anymore.

Signed-off-by: Nick Budak <thatbudakguy@gmail.com>

Author: thatbudakguy

python-stdlib/errno/errno.py

@@ -34,5 +34,6 @@
 ERANGE = 34  # Math result not representable
 EAFNOSUPPORT = 97  # Address family not supported by protocol
 ECONNRESET = 104  # Connection timed out
+ENOTCONN = 107 # Not connected
 ETIMEDOUT = 110  # Connection timed out
 EINPROGRESS = 115  # Operation now in progress