Bump dotenv from 3.1.7 to 3.1.8

Bumps [dotenv](https://github.com/bkeepers/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
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -136,7 +136,7 @@ GEM
       responders
       warden (~> 1.2.3)
     diff-lcs (1.6.1)
-    dotenv (3.1.7)
+    dotenv (3.1.8)
     drb (2.2.1)
     ed25519 (1.3.0)
     erubi (1.13.1)