chore(deps): update dependency postcss to v8.4.31 [security]

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.28 -> 8.4.31

GitHub Vulnerability Alerts

CVE-2023-44270

An issue was discovered in PostCSS before 8.4.31. It affects linters using PostCSS to parse external Cascading Style Sheets (CSS). There may be \r discrepancies, as demonstrated by @font-face{ font:(\r/*);} in a rule.

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Release Notes

postcss/postcss (postcss)

### [`v8.4.31`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8431) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.30...8.4.31) - Fixed `\r` parsing to fix CVE-2023-44270. ### [`v8.4.30`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8430) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.29...8.4.30) - Improved source map performance (by Romain Menke). ### [`v8.4.29`](https://togithub.com/postcss/postcss/blob/HEAD/CHANGELOG.md#8429) [Compare Source](https://togithub.com/postcss/postcss/compare/8.4.28...8.4.29) - Fixed `Node#source.offset` (by Ido Rosenthal). - Fixed docs (by Christian Oliff).

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Configuration

📅 Schedule: Branch creation - "" in timezone Asia/Singapore, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (a14f8e1) 53.44% compared to head (326c0a2) 53.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3630 +/- ## ========================================== - Coverage 53.44% 53.24% -0.21% ========================================== Files 271 271 Lines 5862 5862 Branches 1396 1396 ========================================== - Hits 3133 3121 -12 - Misses 2729 2741 +12 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/nusmodifications/nusmods/pull/3630/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nusmodifications)

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