fix(node:os): `cpus` bugfix

[dylan-conway]

What does this PR do?

Code was assuming line lengths were not longer than 1024 * 8 bytes. Removed std.io.Reader

fixes #10877

How did you verify your code works?

CI

[github-actions[bot]]

❌ @dylan-conway, your commit has failing tests :(

💪 4 failing tests Darwin AARCH64

• test/js/bun/http/serve.test.ts 2 failing
• test/js/bun/shell/bunshell.test.ts 1 failing
• test/js/bun/shell/commands/rm.test.ts 1 failing
• test/js/node/http2/node-http2.test.js 1 failing

💻 3 failing tests Darwin x64 baseline

• test/cli/install/registry/bun-install-registry.test.ts 1 failing
• test/js/bun/http/serve.test.ts 1 failing
• test/js/web/workers/worker.test.ts 1 failing

💻 3 failing tests Darwin x64

• test/js/bun/http/serve.test.ts 1 failing
• test/js/web/fetch/fetch.test.ts 1 failing
• test/js/web/fetch/fetch.tls.test.ts 1 failing

🐧💪 1 failing tests Linux AARCH64

• test/js/bun/shell/leak.test.ts 1 failing

🪟💻 9 failing tests Windows x64 baseline

• test/cli/install/bunx.test.ts 1 failing
• test/cli/install/registry/bun-install-registry.test.ts 1 failing
• test/integration/next-pages/test/dev-server-ssr-100.test.ts 1 failing
• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/integration/next-pages/test/next-build.test.ts 1 failing
• test/js/bun/shell/bunshell.test.ts 1 failing
• test/js/bun/spawn/spawn.test.ts 1 failing
• test/js/node/child_process/child_process.test.ts 1 failing
• test/js/node/dns/node-dns.test.js 2 failing

🪟💻 7 failing tests Windows x64

• test/cli/install/bunx.test.ts 1 failing
• test/integration/next-pages/test/dev-server-ssr-100.test.ts 1 failing
• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/integration/next-pages/test/next-build.test.ts 1 failing
• test/js/bun/shell/bunshell.test.ts 1 failing
• test/js/bun/spawn/spawn.test.ts 1 failing
• test/js/node/dns/node-dns.test.js 2 failing

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