Update dotenv requirement from ~> 2.7.6 to ~> 2.8.1

[dependabot]

Updates the requirements on dotenv to permit the latest version.

Release notes

Sourced from dotenv's releases.

v2.8.1

What's Changed

• Restore support for EOL'd Ruby versions (2.5, 2.6) (#458)[https://redirect.github.com/Continue to support EOL'd Ruby versions bkeepers/dotenv#458]

Full Changelog: bkeepers/dotenv@v2.8.0...v2.8.1

Changelog

Sourced from dotenv's changelog.

2.8.1 - July 27, 2022

• Restore support for EOL'd Ruby versions (2.5, 2.6) (#458)[https://redirect.github.com/Continue to support EOL'd Ruby versions bkeepers/dotenv#458]

2.8.0 - July 26, 2022

• 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

2.7.6 - July 11, 2020

• Add a Dotenv::Railtie.overload method #403
• Support for more Rails versions #404
• Fix template handling of blank lines and comments #413
• Fix for dotenv-rails Rake task environment allocation#405

2.7.5 - July 31st, 2019

• Fix for \s after separator #399
• README formatting updates #398

2.7.4 - June 23rd, 2019

• Fix NoMethodError in non-Rails environments #394

2.7.3 - June 22nd, 2019

• Fix for parallel spec tasks initializing in development #384
• Test against updated rubies #383, #387
• Conditional branch cleanup for clarity of intent #385
• Fix for load order issue with Railties #391
• NEW: dotenv-templates using the -t flag #377, #393

2.7.2 - March 25th, 2019

• Cleaned up CLI while resolving regressions in 2.7.1 #382

2.7.1 - February 24, 2019

• Fixes regression with CLI experience (#376)

2.7.0 - February 21, 2019

• Add Dotenv.parse method (#362)
• Add Support for Rails 6.0 (#370)
• Improve dotenv CLI output (#374)
• Add GitHub Actions automation (#369)

... (truncated)

Commits

• 45b712a Merge pull request #458 from bkeepers/eol-ruby
• 93a3b0f Prepare for 2.8.1 release
• 7712533 Disable rule that fails on Ruby 2.5
• 4c3e28c Specify ruby_version in .standard.yml
• 0974810 Avoid newer ruby range syntax
• d7c9135 Continue to support EOL'd Ruby versions (sigh)
• 36c117c Prepare for 2.8.0 release
• d93a95b Merge pull request #456 from bkeepers/cli-update
• 029df7a Remove unnecessary method
• 491bfef CL < OptionParser to simplify setup more
• Additional commits viewable in compare view

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