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Issue title

Action `actions/setup-node` pinned to mutable ref `@v4`

Curate findings to include

Pick exactly which findings appear in the issue body. By default the top 5 are included. Uncheck noise, check what matters.

Top 5 (default)
Severity Rule Title File:line
HIGH SEC128 [SEC128] Async function without await — fire-and-forget Promise (AI mistake): Async call … src/data-structures/priority-queue/Prio…:39
HIGH SEC128 [SEC128] Async function without await — fire-and-forget Promise (AI mistake): Async call … src/data-structures/lru-cache/LRUCacheO…:30
HIGH SEC128 [SEC128] Async function without await — fire-and-forget Promise (AI mistake): Async call … src/data-structures/graph/GraphVertex.js:44
HIGH MINED115 Action `codecov/codecov-action` pinned to mutable ref `@v4` .github/workflows/CI.yml:35
HIGH MINED115 Action `actions/setup-node` pinned to mutable ref `@v4` .github/workflows/CI.yml:21
HIGH MINED115 Action `actions/checkout` pinned to mutable ref `@v4` .github/workflows/CI.yml:18
HIGH GHSA-c2c7-rcm5-vvqj picomatch: GHSA-c2c7-rcm5-vvqj package-lock.json
HIGH GHSA-7r86-cg39-jmmj minimatch: GHSA-7r86-cg39-jmmj package-lock.json
HIGH GHSA-3ppc-4f35-3m26 minimatch: GHSA-3ppc-4f35-3m26 package-lock.json
HIGH GHSA-23c5-xmqv-rm74 minimatch: GHSA-23c5-xmqv-rm74 package-lock.json
HIGH GHSA-rf6f-7fwh-wjgh flatted: GHSA-rf6f-7fwh-wjgh package-lock.json
HIGH GHSA-25h7-pfq9-p65f flatted: GHSA-25h7-pfq9-p65f package-lock.json
HIGH GHSA-fv7c-fp4j-7gwp @babel/plugin-transform-modules-systemjs: GHSA-fv7c-fp4j-7gwp package-lock.json
MED SEC087 [SEC087] JS: weak Math.random for crypto: Math.random() is not cryptographically secure; … src/algorithms/statistics/weighted-rand…:39
MED DEPCUR-NPM npm package `eslint-plugin-jest` is 2 major version(s) behind (27.9.0 -> 29.15.2) package.json
MED GHSA-3v7f-55p6-f55p picomatch: GHSA-3v7f-55p6-f55p package-lock.json
MED GHSA-f886-m6hf-6m8v brace-expansion: GHSA-f886-m6hf-6m8v package-lock.json
MED GHSA-2g4f-4pwh-qvx6 ajv: GHSA-2g4f-4pwh-qvx6 package-lock.json
LOW DEPCUR-NPM npm package `jest` is minor version(s) behind (30.2.0 -> 30.4.2) package.json
LOW DEPCUR-NPM npm package `@babel/cli` is minor version(s) behind (7.28.6 -> 7.29.7) package.json
LOW AIC003 Duplicated implementation block across source files src/data-structures/stack/Stack.js:3
LOW AIC003 Duplicated implementation block across source files src/data-structures/linked-list/LinkedL…:78
LOW AIC003 Duplicated implementation block across source files src/data-structures/heap/MinHeapAdhoc.js:2
LOW AIC003 Duplicated implementation block across source files src/algorithms/graph/depth-first-search…:1
LOW AIC003 Duplicated implementation block across source files src/algorithms/graph/bridges/graphBridg…:20
INFO DEPCUR-NPM npm package `@babel/preset-env` is patch version(s) behind (7.29.0 -> 7.29.7) package.json
Reset to top 5 26 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `trekhleb/javascript-algorithms`

**Score: 81/100 (B+)**  ·  26 findings  ·  scanned 2026-06-05 04:30 UTC  ·  23,589 LOC

| Severity | Count |
|---|---|
| CRITICAL | 0 |
| HIGH | 13 |
| MEDIUM | 5 |
| LOW | 7 |

📊 [Full filterable report](https://repobility.com/scan/8d3d103e-42f8-4e30-88b0-2b7bde54a800/)  ·  ![scorecard](https://repobility.com/scan/8d3d103e-42f8-4e30-88b0-2b7bde54a800/report.png?v=1780633808-s2)

### Top findings

1. **HIGH** `SEC128` — Async function without await — fire-and-forget Promise (AI mistake)
   `src/data-structures/priority-queue/PriorityQueue.js:39`
2. **HIGH** `SEC128` — Async function without await — fire-and-forget Promise (AI mistake)
   `src/data-structures/lru-cache/LRUCacheOnMap.js:30`
3. **HIGH** `SEC128` — Async function without await — fire-and-forget Promise (AI mistake)
   `src/data-structures/graph/GraphVertex.js:44`
4. **HIGH** `MINED115` — Action `codecov/codecov-action` pinned to mutable ref `@v4`
   `.github/workflows/CI.yml:35` · ✓ Repobility
5. **HIGH** `MINED115` — Action `actions/setup-node` pinned to mutable ref `@v4`
   `.github/workflows/CI.yml:21` · ✓ Repobility

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**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.

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