[Bug] yarn tools:update - fails due to postcss in text-variant-tune

`yarn tools:update` fails due to postcss
The problem is fixed in postcss 8.2.12 -> https://github.com/postcss/postcss/issues/1562
Inherited from css-loader@^5.2.1 in example/tools/text-variant-tune
Update to 5.2.7 should fix it.

```
Entering 'example/tools/text-variant-tune'
$ webpack --mode production
assets by status 9.28 KiB [cached] 1 asset
runtime modules 663 bytes 3 modules
orphan modules 953 bytes [orphan] 2 modules
built modules 15.3 KiB [built]
modules by path ./src/assets/*.svg 3.43 KiB
./src/assets/call-out.svg 1.23 KiB [built] [code generated]
./src/assets/citation.svg 1.7 KiB [built] [code generated]
./src/assets/details.svg 516 bytes [built] [code generated]
./src/index.js + 2 modules 5.16 KiB [built] [code generated]
./node_modules/style-loader/dist/runtime/injectStylesIntoStyleTag.js 6.67 KiB [built] [code generated]
./node_modules/css-loader/dist/cjs.js!./src/styles/index.css 39 bytes [not cacheable] [built] [code generated] [1 error]

ERROR in ./src/styles/index.css (./node_modules/css-loader/dist/cjs.js!./src/styles/index.css)
Module build failed (from ./node_modules/css-loader/dist/cjs.js):
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './package.json' is not defined by "exports" in C:\__Work\js\editorjs\example\tools\text-variant-tune\node_modules\postcss\package.json
at new NodeError (node:internal/errors:400:5)
at exportsNotFound (node:internal/modules/esm/resolve:295:10)
at packageExportsResolve (node:internal/modules/esm/resolve:631:9)
at resolveExports (node:internal/modules/cjs/loader:538:36)
at Module._findPath (node:internal/modules/cjs/loader:607:31)
at Module._resolveFilename (node:internal/modules/cjs/loader:1025:27)
at Module._load (node:internal/modules/cjs/loader:885:27)
at Module.require (node:internal/modules/cjs/loader:1105:19)
at require (C:\__Work\js\editorjs-example\example\tools\text-variant-tune\node_modules\v8-compile-cache\v8-compile-cache.js:159:20)
at Object. (C:\__Work\js\editorjs-example\example\tools\text-variant-tune\node_modules\css-loader\dist\index.js:12:39)
@ ./src/styles/index.css 2:12-90 9:17-24 13:15-29
@ ./src/index.js 1:0-28
```

OS: Win 10, nodejs: 19.3.0, yarn: 1.22.19

Editor.js version: last