Bump cross-spawn to fix audit

[r100-stack]

Changes

Fixes GHSA-3xgq-45jj-v275.

Ran pnpm audit --fix, then ran pnpm i to update the lockfile, and then manually deleted the package.json overrides.

However, the audit was still failing. Upon investigating, it was coming from one of the nested dependencies of @itwin/itwinui-react's @swc/cli dependency. So, I bumped @swc/cli too since I didn't find any big changes in their changelog. I then confirmed that it fixed the audit.

Testing

• Confirm pnpm audit passes (run)
• [ ] Confirm build passes
  • Noticed that build for website is failing, even in the current main. So deemed it unrelated and added it as an after PR TODO.
• Confirm CI passes
• Confirm that esm and cjs build outputs are the same. E.g. tested for Table.js

Docs

Didn't add a changeset since I didn't think a bump in cross-spawn was important enough to warrant a changeset. Can add one if reviewers feel otherwise.

After PR TODOs:

• See why build of website is failing

  Error

  website:build:  generating static routes 
  website:build: λ /_astro/ec.dy9ns.js
  website:build:   └─ /_astro/ec.dy9ns.js (+3ms)
  website:build: λ /_astro/ec.ulvux.css
  website:build:   └─ /_astro/ec.ulvux.css (+1ms)
  website:build: ▶ src/pages/docs/components.astro
  website:build:   └─ /docs/components/index.html (+43ms)
  website:build: ▶ src/pages/docs/[...slug].astro
  website:build:   ├─ /docs/alert/index.htmlCannot find package '/iTwinUI/apps/website/node_modules/outdent/package.json' imported from /iTwinUI/apps/website/dist/chunks/UnstableApiCard_DAd-Wouo.mjs
  website:build: Did you mean to import outdent/lib/index.js?
  website:build:   Stack trace:
  website:build:     at legacyMainResolve (node:internal/modules/esm/resolve:214:26)
  website:build:     at moduleResolve (node:internal/modules/esm/resolve:910:20)
  website:build:     at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:396:12)
  website:build:     at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:240:38)
  website:build:     at link (node:internal/modules/esm/module_job:84:36)
  website:build:  ELIFECYCLE  Command failed with exit code 1.
  website:build: ERROR: command finished with error: command (/iTwinUI/apps/website) /usr/local/bin/pnpm run build exited (1)
  website#build: command (/iTwinUI/apps/website) /usr/local/bin/pnpm run build exited (1)