CI uses both node:10 and node:latest

[JoshuaKGoldberg]

Overview

tslint-to-eslint-config/.circleci/config.yml

Line 6 in a93f267

- image: circleci/node:10

tslint-to-eslint-config/.circleci/config.yml

Line 34 in a93f267

- image: circleci/node:latest

Actual Behavior

This is an old discrepancy I'd never noticed until now. They should all ideally be on the same image, to reduce the number of images CircleCI has to potentially redownload / pull from cache

Expected Behavior

Move everything to node:latest.