Bump postcss from 8.4.12 to 8.4.18

[dependabot[bot]]

Bumps postcss from 8.4.12 to 8.4.18.

Release notes

Sourced from postcss's releases.

8.4.18

• Fixed an error on absolute: true with empty sourceContent (by @​KingSora).

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.

8.4.18

• Fixed an error on absolute: true with empty sourceContent (by Rene Haas).

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

• d33f272 Release 8.4.18 version
• 75d6556 Update dependencies
• a11d868 Merge pull request #1788 from KingSora/main
• a1c0b8b delete package.lock
• 28be739 add toFileUrl function
• edfd3e0 improvement
• 3d0d204 improve test
• 3dac15c absolute sourcemaps have source content
• 767c83e Merge pull request #1787 from muddv/architecture-title-fix
• 567b976 Change title
• Additional commits viewable in compare view

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