By Rob Lenihan Bitcoin diehards may have felt they walking on ‘the boulevard of broken dreams,’ one analyst says, but cryptocurrency ‘is not going away.’ The summer is officially underway and investors are hoping the crypto winter may be coming to an end. Bitcoin was off nearly 1% to $21,252.05 at last check on June 21, according to CoinGecko, but the world’s most popular cryptocurrency was up 6.1% in the past 24 hours. That was in sharp contrast to the weekend, when bitcoin dropped as low as $17,592.78, marking the first time it had fallen below $20,000 since December 2020. ‘Boulevard of Brok…