chore: upgrade to `std@0.215.0` #2933

Job	Run time
ansi macOS-latest deno-v1.x	24s
ansi windows-latest deno-v1.x	25s
ansi ubuntu-latest deno-v1.x	15s
command macOS-latest deno-v1.x	35s
command windows-latest deno-v1.x	41s
command ubuntu-latest deno-v1.x	29s
flags macOS-latest deno-v1.x	23s
flags windows-latest deno-v1.x	23s
flags ubuntu-latest deno-v1.x	16s
keycode macOS-latest deno-v1.x	21s
keycode windows-latest deno-v1.x	21s
keycode ubuntu-latest deno-v1.x	11s
keypress macOS-latest deno-v1.x	18s
keypress windows-latest deno-v1.x	21s
keypress ubuntu-latest deno-v1.x	9s
prompt macOS-latest deno-v1.x	53s
prompt windows-latest deno-v1.x	56s
prompt ubuntu-latest deno-v1.x	49s
table macOS-latest deno-v1.x	21s
table windows-latest deno-v1.x	25s
table ubuntu-latest deno-v1.x	15s
testing macOS-latest deno-v1.x	22s
testing windows-latest deno-v1.x	23s
testing ubuntu-latest deno-v1.x	17s
	10m 13s

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