Adjust budget bar color

Slightly lighten the grey color of the budget bar in the monthly comparison chart.

src/pages/Analytics.tsx

@@ -147,7 +147,7 @@ const Analytics = () => {
                 <YAxis tickFormatter={formatYAxisTick} />
                 <Tooltip formatter={formatTooltip} />
                 <Legend />
-                <Bar dataKey="budget" name="예산" fill="#8E9196" radius={[4, 4, 0, 0]} />
+                <Bar dataKey="budget" name="예산" fill="#C8C8C9" radius={[4, 4, 0, 0]} />
                 <Bar dataKey="expense" name="지출" fill="#81c784" radius={[4, 4, 0, 0]} />
               </BarChart>
             </ResponsiveContainer>