fix: Correct shell activation command in Makefile for proper environment setup

Makefile

@@ -147,7 +147,7 @@ attach: ## Open a shell in the container
 	docker-compose exec -it ${TARGET} /bin/bash
 shell: ## Open a shell in the local environment
 	@echo "Opening a shell in the local environment..."
-	source .venv/bin/activate.${SHELL} && /bin/${SHELL}
+	source .venv/bin/activate.${SHELL}; /bin/${SHELL}
 requirements: ## Export the requirements to a file
 	@echo "Exporting requirements to requirements.txt..."
 	poetry export --without-hashes -f requirements.txt -o requirements.txt