Based on en docs changes change recommended outdated mocha webpack module version to actual
mocha-webpack last commit 3 years ago. Support mocha in version 4.x.x & 5.x.x
mocha-webpack fork mochapack last commit 3 month ago. Support mocha in version 5.x.x, 6.x.x, 7.x.x

Leave first header unchanged to keep consistency with en version

What kind of change does this PR introduce? (check at least one)

• Bugfix

• Feature

• Code style update

• Refactor

• Build-related changes

• Other, please describe:
  docs(ru) translation update
  Does this PR introduce a breaking change? (check one)

• Yes

• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch.
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue-test-utils/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information: