1.12.1 / 2021.07.19

• fix: Big{U|}Int64Array in crypto.getRandomValues (#11447)
• fix(extensions/http): correctly concat cookie headers (#11422)
• fix(extensions/web): aborting a FileReader should not affect later reads (#11381)
• fix(repl): output error without hanging when input is invalid (#11426)
• fix(tsc): add .at() types manually to tsc (#11443)
• fix(workers): silently ignore non-existent worker IDs (#11417)