fix: Fix build in environments without Python 2

Inspired by: prometheus/prometheus#8733

I successfully built this commit using the docker images:

- node:16.13.2-stretch
- node:16.13.2-buster
- node:16.13.2-bullseye
- node:16.13.2-alpine3.14
- node:16.13.2-alpine3.15
- node:17.3.1-stretch
- node:17.3.1-buster
- node:17.3.1-bullseye
- node:17.3.1-alpine3.14
- node:17.3.1-alpine3.15

Note that building in any `node:17` image requires
`NODE_OPTIONS=--openssl-legacy-provider` during `npm install`.