chore(deps-dev): bump postcss from 8.4.12 to 8.4.17

[dependabot[bot]]

Bumps postcss from 8.4.12 to 8.4.17.

Release notes

Sourced from postcss's releases.

8.4.17

• Fixed Node.before() unexpected behavior (by @​romainmenke).
• Added TOC to docs (by @​muddv).

8.4.16

• Fixed Root AST migration.

8.4.15

• Fixed AST normalization after using custom parser with old PostCSS AST.

8.4.14

• Print “old plugin API” warning only if plugin was used (by @​zardoy).

8.4.13

• Fixed append() error after using .parent (by @​thecrypticace).

Changelog

Sourced from postcss's changelog.

8.4.17

• Fixed Node.before() unexpected behavior (by Romain Menke).
• Added TOC to docs (by Mikhail Dedov).

8.4.16

• Fixed Root AST migration.

8.4.15

• Fixed AST normalization after using custom parser with old PostCSS AST.

8.4.14

• Print “old plugin API” warning only if plugin was used (by @​zardoy).

8.4.13

• Fixed append() error after using .parent (by Jordan Pittman).

Commits

• 34c0de4 Release 8.4.17 version
• 9454dcc Merge pull request #1781 from romainmenke/fix-issue-1778--practical-snowy-owl...
• 7278432 recalculate the insertion index after normalizing a node
• e1538a4 Merge pull request #1780 from romainmenke/add-test-for-sorting-nodes--courage...
• 24c1432 add test for sorting container.nodes
• c047e0a Fix index
• b163f07 Clean up CI
• a002d8e Update docs
• cedc6a5 Merge pull request #1779 from muddv/docs-index
• 967d584 Update docs/writing-a-plugin.md
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #109.