Provide Next.js postcss version to cssnano-simple

[timneutkens]

This ensures the correct version of postcss is always used even when npm does not resolve peerdeps correctly.

Depends on Timer/cssnano-simple#16

Fixes #24882

Bug

• Related issues linked using fixes #number
• Integration tests added
• Errors have helpful link attached, see contributing.md

Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
• Related issues linked using fixes #number
• Integration tests added
• Documentation added
• Telemetry added. In case of a feature if it's used or not.
• Errors have helpful link attached, see contributing.md

Documentation / Examples

• Make sure the linting passes

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
buildDuration	13s	13.1s	⚠️ +65ms
buildDurationCached	3.3s	3.2s	-51ms
nodeModulesSize	49.3 MB	49.3 MB	⚠️ +162 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.317	2.336	⚠️ +0.02
/ avg req/sec	1079.1	1070.08	⚠️ -9.02
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.309	1.286	-0.02
/error-in-render avg req/sec	1909.82	1943.65	+33.83

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
359.HASH.js gzip	3.09 kB	3.09 kB	✓
framework-HASH.js gzip	42 kB	42 kB	✓
main-HASH.js gzip	20.6 kB	20.6 kB	✓
webpack-HASH.js gzip	1.49 kB	1.49 kB	✓
Overall change	67.2 kB	67.2 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
polyfills-HASH.js gzip	31.1 kB	31.1 kB	✓
Overall change	31.1 kB	31.1 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
_app-HASH.js gzip	803 B	803 B	✓
_error-HASH.js gzip	3.18 kB	3.18 kB	✓
amp-HASH.js gzip	526 B	526 B	✓
css-HASH.js gzip	329 B	329 B	✓
hooks-HASH.js gzip	903 B	903 B	✓
index-HASH.js gzip	261 B	261 B	✓
link-HASH.js gzip	1.66 kB	1.66 kB	✓
routerDirect..HASH.js gzip	319 B	319 B	✓
withRouter-HASH.js gzip	320 B	320 B	✓
bb14e60e810b..30f.css gzip	125 B	125 B	✓
Overall change	8.42 kB	8.42 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
_buildManifest.js gzip	390 B	390 B	✓
Overall change	390 B	390 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
index.html gzip	531 B	531 B	✓
link.html gzip	544 B	544 B	✓
withRouter.html gzip	524 B	524 B	✓
Overall change	1.6 kB	1.6 kB	✓

---

Webpack 4 Mode (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
buildDuration	11.3s	11.2s	-170ms
buildDurationCached	4.5s	4.4s	-42ms
nodeModulesSize	49.3 MB	49.3 MB	⚠️ +162 B

Page Load Tests Overall increase ✓

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
/ failed reqs	0	0	✓
/ total time (seconds)	2.319	2.312	-0.01
/ avg req/sec	1078.14	1081.33	+3.19
/error-in-render failed reqs	0	0	✓
/error-in-render total time (seconds)	1.293	1.263	-0.03
/error-in-render avg req/sec	1932.97	1979.67	+46.7

Client Bundles (main, webpack, commons)

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
14.HASH.js gzip	3.11 kB	3.11 kB	✓
677f882d2ed8..HASH.js gzip	13.9 kB	13.9 kB	✓
framework.HASH.js gzip	41.8 kB	41.8 kB	✓
main-HASH.js gzip	7.81 kB	7.81 kB	✓
webpack-HASH.js gzip	1.19 kB	1.19 kB	✓
Overall change	67.8 kB	67.8 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
polyfills-HASH.js gzip	31.3 kB	31.3 kB	✓
Overall change	31.3 kB	31.3 kB	✓

Client Pages

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
_app-HASH.js gzip	791 B	791 B	✓
_error-HASH.js gzip	3.83 kB	3.83 kB	✓
amp-HASH.js gzip	531 B	531 B	✓
css-HASH.js gzip	333 B	333 B	✓
hooks-HASH.js gzip	910 B	910 B	✓
index-HASH.js gzip	230 B	230 B	✓
link-HASH.js gzip	1.64 kB	1.64 kB	✓
routerDirect..HASH.js gzip	297 B	297 B	✓
withRouter-HASH.js gzip	293 B	293 B	✓
e025d2764813..52f.css gzip	125 B	125 B	✓
Overall change	8.98 kB	8.98 kB	✓

Client Build Manifests

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
_buildManifest.js gzip	418 B	418 B	✓
Overall change	418 B	418 B	✓

Rendered Page Sizes

	vercel/next.js canary	timneutkens/next.js fix/24882	Change
index.html gzip	575 B	575 B	✓
link.html gzip	586 B	586 B	✓
withRouter.html gzip	568 B	568 B	✓
Overall change	1.73 kB	1.73 kB	✓

Commit: f64745f