Change snake head color to light green

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Description

This PR addresses the issue by modifying the color of the snake's head in the game to light green. The RGB value for light green, (144, 238, 144), is used to update the color of the snake's head.

Summary

• Modified the color of the snake's head in the update_display method of the Game class in cli_snake_game/game.py from red to light green.

Fixes #32.

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