benchmark: update iterations in benchmark/util/normalize-encoding.js
Refs: https://github.com/nodejs/node/issues/50571
Belowing are the score improvement after 10X iteration change:
util/normalize-encoding.js n=1000000
util/normalize-encoding.js input="": n=1000000 percent=301.90%
util/normalize-encoding.js input="utf8": n=1000000 percent=257.18%
util/normalize-encoding.js input="utf-8": n=1000000 percent=247.71%
util/normalize-encoding.js input="UTF-8": n=1000000 percent=158.92%
util/normalize-encoding.js input="UTF8": n=1000000 percent=205.67%
util/normalize-encoding.js input="Utf8": n=1000000 percent=163.09%
util/normalize-encoding.js input="ucs2": n=1000000 percent=192.82%
util/normalize-encoding.js input="UCS2": n=1000000 percent=179.22%
util/normalize-encoding.js input="utf16le": n=1000000 percent=239.94%
util/normalize-encoding.js input="UTF16LE": n=1000000 percent=207.57%
util/normalize-encoding.js input="binary": n=1000000 percent=183.19%
util/normalize-encoding.js input="BINARY": n=1000000 percent=150.46%
util/normalize-encoding.js input="latin1": n=1000000 percent=198.72%
util/normalize-encoding.js input="base64": n=1000000 percent=237.31%
util/normalize-encoding.js input="BASE64": n=1000000 percent=166.36%
util/normalize-encoding.js input="hex": n=1000000 percent=231.76%
util/normalize-encoding.js input="HEX": n=1000000 percent=198.36%
util/normalize-encoding.js input="foo": n=1000000 percent=192.08%
util/normalize-encoding.js input="undefined": n=1000000 percent=383.12%
util/normalize-encoding.js input="group_common": n=1000000 percent=160.35%
util/normalize-encoding.js input="group_upper": n=1000000 percent=155.27%
util/normalize-encoding.js input="group_uncommon": n=1000000 percent=250.76%
util/normalize-encoding.js input="group_misc": n=1000000 percent=169.54%