Update python to 3.11 and use StrEnum

Signed-off-by: Egor Savkin <es@m-labs.hk>

flake.lock

@@ -18,16 +18,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1641870998,
-        "narHash": "sha256-6HkxR2WZsm37VoQS7jgp6Omd71iw6t1kP8bDbaqCDuI=",
+        "lastModified": 1671313200,
+        "narHash": "sha256-itZTrtHeDJjV696+ur0/TzkTqb5y3Eb57WRLRPK3rwA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "386234e2a61e1e8acf94dfa3a3d3ca19a6776efb",
+        "rev": "0938d73bb143f4ae037143572f11f4338c7b2d1c",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-21.11",
+        "ref": "nixos-22.11",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,7 +1,7 @@
 {
   description = "Firmware for the Sinara 8451 Thermostat";
 
-  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-21.11;
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-22.11;
   inputs.mozilla-overlay = { url = github:mozilla/nixpkgs-mozilla; flake = false; };
 
   outputs = { self, nixpkgs, mozilla-overlay }:
@@ -70,7 +70,7 @@
           rustPlatform.rust.rustc
           rustPlatform.rust.cargo
           openocd dfu-util
-          ] ++ (with python3Packages; [
+          ] ++ (with python311Packages; [
             numpy matplotlib
           ]);
       };

pytec/autotune.py

@@ -1,7 +1,7 @@
 import math
 import logging
 from collections import deque, namedtuple
-from enum import Enum
+from enum import StrEnum
 
 from pytec.client import Client
 
@@ -11,7 +11,7 @@ from pytec.client import Client
 # See https://github.com/t0mpr1c3/Arduino-PID-AutoTune-Library
 
 
-class PIDAutotuneState(Enum):
+class PIDAutotuneState(StrEnum):
     STATE_OFF = 'off'
     STATE_RELAY_STEP_UP = 'relay step up'
     STATE_RELAY_STEP_DOWN = 'relay step down'