Update GameOfLifeTests.cs #2287
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Adds specificity for requiring exactly 3 live neighbors for condition of dead cells coming back to life
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The rule in the instructions "Any dead cell with exactly three live neighbors becomes a live cell." is not explicitly covered by the test "Dead_cells_with_three_live_neighbors_become_alive".
This PR updates the relevant test to match the rule from the instructions more explicitly by covering both the scenarios where there are exactly 3 live neighbors and when there are 4 live neighbors for a cell.