Bump to 4.18.1-0

[compulim]

Related to #5239.

Changelog Entry

(Bumping to 4.18.1-0)

Description

After release of 4.18.0, bumping to 4.18.1-0.

Specific Changes

• npm version --no-git-tag-version 4.18.1-0
• Add 4.18.0 to servicingPlan.json

• [x] ~I have added tests and executed them locally~
• [x] ~I have updated CHANGELOG.md~
• [x] ~I have updated documentation~

Review Checklist

This section is for contributors to review your work.

• [x] ~Accessibility reviewed (tab order, content readability, alt text, color contrast)~
• [x] ~Browser and platform compatibilities reviewed~
• [x] ~CSS styles reviewed (minimal rules, no z-index)~
• [x] ~Documents reviewed (docs, samples, live demo)~
• [x] ~Internationalization reviewed (strings, unit formatting)~
• [x] package.json and package-lock.json reviewed
• [x] ~Security reviewed (no data URIs, check for nonce leak)~
• [x] ~Tests reviewed (coverage, legitimacy)~

[compulim]

MockBot is currently down. These changes should not fail any tests. Will force merge in.