Upgrade to Python 3.12 (#13)

* Upgrade to Python 3.12

* Install latest package python

Author: faucomte97

Pipfile

@@ -23,13 +23,13 @@ name = "pypi"
 # 5. Run `pipenv install --dev` in your terminal.
 
 [packages]
-codeforlife = {ref = "v0.18.0", git = "https://github.com/ocadotechnology/codeforlife-package-python.git"}
+codeforlife = {ref = "v0.18.12", git = "https://github.com/ocadotechnology/codeforlife-package-python.git"}
 # 🚫 Don't add [packages] below that are inherited from the CFL package.
 
 [dev-packages]
-codeforlife = {ref = "v0.18.0", git = "https://github.com/ocadotechnology/codeforlife-package-python.git", extras = ["dev"]}
+codeforlife = {ref = "v0.18.12", git = "https://github.com/ocadotechnology/codeforlife-package-python.git", extras = ["dev"]}
 # codeforlife = {file = "../codeforlife-package-python", editable = true, extras = ["dev"]}
 # 🚫 Don't add [dev-packages] below that are inherited from the CFL package.
 
 [requires]
-python_version = "3.8"
+python_version = "3.12"