Replace envfile with dotenv

[dependabot]

Bumps envfile from 5.2.0 to 6.18.0.

It looks like we don't need this dependency any more - we can use dotenv instead?

Changelog

Sourced from envfile's changelog.

v6.18.0 2022 September 8

• Normalize string values when parsing to JSON - Thanks to kcarra for [pull request #194](bevry/envfile#194)

v6.17.0 2021 July 30

• Use Record<string, string> for data, and Record<string, any> for inputs. - Thanks to adamhl8 for [pull request #163](bevry/envfile#163)

v6.16.0 2021 July 30

• Node v16 support
• Now supports --env2json, --json2env as well.
• Don't use npx in our tests anymore, it doesn't do what we want just causes problems, such as prompting for installs and messing with output.
• Updated dependencies, base files, and editions using boundation

v6.15.0 2021 July 28

• Updated dependencies, base files, and editions using boundation

v6.14.0 2020 September 4

• Updated dependencies, base files, and editions using boundation

v6.13.0 2020 August 18

• Updated dependencies, base files, and editions using boundation

v6.12.0 2020 August 4

• Updated dependencies, base files, and editions using boundation

v6.11.0 2020 July 22

• Updated dependencies, base files, and editions using boundation

v6.10.0 2020 July 22

• Updated dependencies, base files, and editions using boundation

v6.9.0 2020 July 3

• Updated dependencies, base files, and editions using boundation

v6.8.0 2020 June 25

• Updated dependencies, base files, and editions using boundation

v6.7.0 2020 June 21

• Updated dependencies, base files, and editions using boundation

... (truncated)

Commits

• 53e31c8 v6.18.0. Feature. Normalize strings when parsing JSON.
• f39a8f4 Merge pull request #194 from kcarra/handle-quotes
• 251f466 equal => deepEqual
• eb4873c normalize quotes for values in .env
• 8e7eeb7 v6.17.0 - record type, releases #163 by @​adamhl8 with mods
• 691c528 Data is a Record<string, string> (#163)
• 6697314 v6.16.0 - node v16, --env2json, --json2env, fix tests
• d6669b2 v6.15.0 - boundation, changelog, version bump
• 1b2b1fc Bump eslint-config-prettier from 6.14.0 to 6.15.0 (#121)
• 3a67f2c Bump safeps from 10.14.0 to 10.15.0 (#122)
• Additional commits viewable in compare view

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[katstevens]

I think I have a fix for this (commit incoming)