fix(template-base): use minimum instead of exact version when replacing ELECTRON_FORGE/VERSION in templates

[erikian]

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Summarize your changes:
This PR ensures that the most recent compatible version of @electron-forge/plugin-webpack will be installed by create-electron-app. While the package.json might still show an older version when using create-electron-app (as outlined in #3019 (comment)), the version yarn / npm will actually install is the most recent.

[MarshallOfSound]

This aligns with siblingDep in init-npm 👍