test(options): set jest.setTimeout

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

modify only

Motivation / Use-Case

We changed the time from 30000 to 60000, but options.test.js has many execution times.
So, I specified 20000 as jest.setTime to options.tests.js.
in next branch, this file is refactored and the execution is quite fast.
https://github.com/webpack/webpack-dev-server/blob/feature/refactor-tests/test/options.test.js

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #1999 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1999   +/-   ##
=======================================
  Coverage   92.52%   92.52%           
=======================================
  Files          28       28           
  Lines        1083     1083           
  Branches      324      324           
=======================================
  Hits         1002     1002           
  Misses         77       77           
  Partials        4        4

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