chore(deps-dev): bump postcss from 8.5.6 to 8.5.15 in /frontend

[dependabot]

Bumps postcss from 8.5.6 to 8.5.15.

Release notes

Sourced from postcss's releases.

8.5.15

• Fixed declaration parsing performance (by @​homanp).

8.5.14

• Fixed custom syntax regression (by @​43081j).

8.5.13

• Fixed postcss-scss commend regression.

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).

8.5.9

• Speed up source map encoding paring in case of the error.

8.5.8

• Fixed Processor#version.

8.5.7

• Improved source map annotation cleaning performance (by CodeAnt AI).

Changelog

Sourced from postcss's changelog.

8.5.15

• Fixed declaration parsing performance (by @​homanp).

8.5.14

• Fixed custom syntax regression (by @​43081j).

8.5.13

• Fixed postcss-scss commend regression.

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).

8.5.9

• Speed up source map encoding paring in case of the error.

8.5.8

• Fixed Processor#version.

8.5.7

• Improved source map annotation cleaning performance (by CodeAnt AI).

Commits

• eae46db Release 8.5.15 version
• 79508ff Update CI actions
• b128e21 Speed up declaration parsing by avoiding creating new array on each token
• 9825dca Fix code format
• 55789c8 Update dependencies
• 84fbbe9 Install older pnpm action for old Node.js
• 9f860bd Revert pnpm action for old Node.js
• 0877198 Update CI actions
• b2d1a33 Fix linter warnings
• 0700dac Merge pull request #2088 from rootvector2/add-oss-fuzz-harness
• Additional commits viewable in compare view

---

Note

Low Risk
Lockfile-only dev dependency bump with no runtime or app logic changes; main risk is regressions in CSS build tooling.

Overview
Bumps the frontend devDependency on PostCSS to ^8.5.15 and refreshes package-lock.json so the resolved build toolchain uses postcss 8.5.15 (and nanoid 3.3.12 as its dependency). No application source changes—only the CSS processing stack used at build time (e.g. with Tailwind/Vite) is updated.

The jump from 8.5.6 to 8.5.15 pulls in several patch releases, including security and stability fixes (e.g. XSS and unsafe file read mitigations in recent 8.5.x notes) plus parsing performance improvements.

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