Update utools from 2.0.7 to 2.1.0

[duhd1993]

Created with brew bump-cask-pr.

[bevanjkay]

I have seen this URL return version 2.1.0 as follows;

curl https://publish.u-tools.cn/version2/latest-mac.yml

version: 2.1.0
files:
  - url: uTools-2.1.0-mac.zip
    sha512: JHNxFGzRGEJ3UJvlxz1R1KPfcUobB8g6kvkuPJjXbSHGStJGHeH96QdhM466TumiiwAmE7MKHJ7U2cRn/IAjnw==
    size: 81693389
    blockMapSize: 86442
  - url: uTools-2.1.0.dmg
    sha512: iW2TLi3EtzOFG4MKpeegIV3XrYWJQnDymuOqeTvXjViC/ea6xSbruAKGkcM4l/sSrTz4nUbr85ORwC0OK4JTjQ==
    size: 84392722
path: uTools-2.1.0-mac.zip
sha512: JHNxFGzRGEJ3UJvlxz1R1KPfcUobB8g6kvkuPJjXbSHGStJGHeH96QdhM466TumiiwAmE7MKHJ7U2cRn/IAjnw==
releaseDate: '2021-07-22T02:08:13.473Z'

Not sure if it could be an A/B test of sorts.
We could use the homepage for livecheck instead, however the electron_builder strategy is preferable.

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EDIT: the same curl request, one minute apart, yielded 2.0.7 the first time, and 2.1.0 the second time.

[bevanjkay]

Thank you @duhd1993!