fix: replace bundledDeps with externalDeps

[lachlancollins]

Re-fixes #42 after my confusion around option naming 🤦

New description:

/** Additional dependencies to externalize if not detected by `vite-plugin-externalize-deps` */
externalDeps?: Array<string | RegExp>

Note bundledDeps did not work (included node_modules in output), so it has been removed

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[jprosevear]

@lachlancollins thanks - works well