deps: bump postcss from 8.5.9 to 8.5.12 in /samples/react/login-pkce in the npm_and_yarn group across 1 directory

[dependabot]

Bumps the npm_and_yarn group with 1 update in the /samples/react/login-pkce directory: postcss.

Updates postcss from 8.5.9 to 8.5.12

Release notes

Sourced from postcss's releases.

8.5.12

• Fixed reading any file via user-generated CSS.
• Added opts.unsafeMap to disable checks.

8.5.11

• Fixed nested brackets parsing performance (by @​offset).

8.5.10

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

Changelog

Sourced from postcss's changelog.

8.5.12

• Fixed reading any file via user-generated CSS.
• Added opts.unsafeMap to disable checks.

8.5.11

• Fixed nested brackets parsing performance (by @​offset).

8.5.10

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

Commits

• 9bc81c4 Release 8.5.12 version
• 85c4d7d Another try to fix coverage
• 94484ca Try to fix coverage
• c64b748 Load only .map source maps
• aaec7b7 Avoid throwing JSON parsing errors for non-JSON source maps
• 233fb26 Mention original author of the solution
• 2502f75 Release 8.5.11 version
• 5ca1901 Speed up parsing many nested brackets
• 42b5337 Update dependencies
• 7e36e15 Cache node.raws locally in Stringifier hot methods
• Additional commits viewable in compare view

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