Bump dotenv from 3.1.2 to 3.1.8

Bumps [dotenv](https://github.com/bkeepers/dotenv) from 3.1.2 to 3.1.8.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/main/Changelog.md)
- [Commits](https://github.com/bkeepers/dotenv/compare/v3.1.2...v3.1.8)

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

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

Gemfile.lock

@@ -289,7 +289,7 @@ GEM
     diff-lcs (1.6.2)
     digest (3.2.1)
     docile (1.4.1)
-    dotenv (3.1.2)
+    dotenv (3.1.8)
     drb (2.2.3)
     em-http-request (1.1.7)
       addressable (>= 2.3.4)