fix: raise node engine requirement to 14.18

[rayzr522]

closes #825

rollup themselves have this as the engine requirement: https://github.com/rollup/rollup/blob/f125345413ea686003fb4f4c650a79c321372d45/package.json#L156

this is necessary bc 14.18.0 is when support for node:-prefixed imports was added, which are now apparently included in the rollup bundle 😅

(source)

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📜 Install scripts

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Package	Script field	Source
@swc/core@1.3.35 (upgraded)	postinstall	package.json via tsup@6.4.0
esbuild@0.17.7 (upgraded)	postinstall	package.json via bundle-require@4.0.1

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