Add flake8 to devcontainer extensions

.devcontainer/Python 3.11/devcontainer.json

@@ -4,16 +4,12 @@
 	"name": "Python 3.11",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
 	"image": "mcr.microsoft.com/devcontainers/python:1-3.11-bookworm",
-
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	// "features": {},
-
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
-
 	// Use 'postCreateCommand' to run commands after the container is created.
 	"postCreateCommand": "pip3 install --user -r requirements-dev.txt",
-
 	// Configure tool-specific properties.
 	"customizations": {
 		"vscode": {
@@ -24,11 +20,11 @@
 				"hbenl.vscode-test-explorer",
 				"redhat.vscode-xml",
 				"ninoseki.vscode-pylens",
-				"ms-python.black-formatter"
+				"ms-python.black-formatter",
+				"ms-python.flake8"
 			]
 		}
 	}
-
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
 	// "remoteUser": "root"
 }