chore(deps): update dependency dotenv-rails to v2.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
dotenv-rails	2.7.6 -> 2.8.1

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Release Notes

bkeepers/dotenv (dotenv-rails)

v2.8.1

Compare Source

• Restore support for EOL'd Ruby versions (2.5, 2.6) (#​458)[https://github.com/bkeepers/dotenv/pull/458](https://togithub.com/bkeepers/dotenv/pull/458)8]

v2.8.0

Compare Source

• Drop support for Ruby 2.4, 2.5, and 2.6, which are EOL
• Fix template (-t) handling of export declarations #​416
• Unescape escaped characters when value is not quoted #​421
• Add overload option for the CLI ($ dotenv --overload -f .env.local) #​445

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