Bump dotenv-rails from 2.8.1 to 3.0.2 (#467)

Bumps [dotenv-rails](https://github.com/bkeepers/dotenv) from 2.8.1 to 3.0.2.
- [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/v2.8.1...v3.0.2)

---
updated-dependencies:
- dependency-name: dotenv-rails
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -139,10 +139,10 @@ GEM
     debug (1.9.1)
       irb (~> 1.10)
       reline (>= 0.3.8)
-    dotenv (2.8.1)
-    dotenv-rails (2.8.1)
-      dotenv (= 2.8.1)
-      railties (>= 3.2)
+    dotenv (3.0.2)
+    dotenv-rails (3.0.2)
+      dotenv (= 3.0.2)
+      railties (>= 6.1)
     drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)