By Laura Sanicola (Reuters) -Oil settled nearly unchanged on Wednesday as broader concerns about economic growth and oil demand stagnation weighed against tightening supplies. Brent crude futures rose 45 cents, or 0.4 %, to settle at $106.80 a barrel. The front-month WTI crude futures contract, which expires on Wednesday, rose 19 cents to settle at $102.75, unchanged. Oil prices have been supported by a tighter supply outlook after sanctions against Russia – the world’s second-largest oil exporter and a key European supplier – over its invasion of Ukraine, which Moscow calls a “special operati…