Update dependency autoprefixer to ^9.8.6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
autoprefixer	devDependencies	patch	^9.8.6	source

---

Release Notes

postcss/autoprefixer

v9.8.6

• Fixed env option.

v9.8.5

Compare Source

• Improved Grid Layout warnings (by Daniel Tonon).
• Fixed align-self and justify-self with display: flex (by Daniel Tonon).

v9.8.4

Compare Source

• Replace color output library.

v9.8.3

Compare Source

• Return old non-LTS Node.js versions to avoid breaking changes.

v9.8.2

Compare Source

• Remove Node.js 13.0-13.7 from supported engines, because of buggy ESM support.

v9.8.1

Compare Source

• Replace chalk to kleur (by Luke Edwards).
• Update docs (by @​mbomb007).

---

Renovate configuration

📅 Schedule: "on the 1st through 7th day of the month" in timezone America/Los_Angeles.

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.