chore: remove yargs override once c8 updates to yargs 18

[TomerFi]

Context

PR #391 added an npm overrides entry to force c8 to use yargs@^18.0.0, working around a CJS/ESM interop crash on Node 25 (bcoe/c8#582).

Action

Once bcoe/c8#578 is merged and a new c8 release includes yargs@^18, remove the override from package.json:

"overrides": {
  "c8": {
    "yargs": "^18.0.0"
  }
}

[coderabbitai]

🔗 Related PRs

#389 - ci: disable fail-fast in test matrix [closed]
#391 - fix: override yargs to v18 for Node 25 compatibility [closed]

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