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>

Dockerfile

@@ -1,4 +1,4 @@
-FROM "python:3.10-alpine"
+FROM "python:3.12-alpine"
 STOPSIGNAL SIGINT
 RUN mkdir /app
 WORKDIR /app