Update to Python 3.12

* Remove toml dependency since that comes with Python as of 3.11
* Update toml usage to tomllib in config.py
* Update `with open(...)` for toml file reading to be 'rb'
* Update Pipfile.lock for locked dependencies to work with Python 3.12

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

tools/markov_import.py

@@ -23,7 +23,7 @@ async def main():
     channel = sys.argv[1]
     files = sys.argv[2:]
     server_config = ServerConfig()
-    with open("config.toml") as fp:
+    with open("config.toml", 'rb') as fp:
         server_config.load(fp)
     # This only works on one plugin per config
     bot = Bot(server_config)