Bump dotenv from 3.1.7 to 3.1.8 in the development group

Bumps the development group with 1 update: [dotenv](https://github.com/bkeepers/dotenv).


Updates `dotenv` from 3.1.7 to 3.1.8
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/main/Changelog.md)
- [Commits](bkeepers/dotenv@v3.1.7...v3.1.8)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-version: 3.1.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -131,7 +131,7 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
-    dotenv (3.1.7)
+    dotenv (3.1.8)
     drb (2.2.1)
     erubi (1.13.1)
     et-orbi (1.2.11)