Bump omniauth from 2.1.2 to 2.1.3

Bumps [omniauth](https://github.com/omniauth/omniauth) from 2.1.2 to 2.1.3.
- [Release notes](https://github.com/omniauth/omniauth/releases)
- [Commits](https://github.com/omniauth/omniauth/compare/v2.1.2...v2.1.3)

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

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

Gemfile

@@ -34,7 +34,7 @@ gem "image_processing", "~> 1.14.0"
 gem "invisible_captcha", "~> 2.3.0"
 gem "kaminari", "~> 1.2.2"
 gem "mini_magick", "~> 4.13.2"
-gem "omniauth", "~> 2.1.2"
+gem "omniauth", "~> 2.1.3"
 gem "omniauth-facebook", "~> 10.0.0"
 gem "omniauth-google-oauth2", "~> 1.2.1"
 gem "omniauth-rails_csrf_protection", "~> 1.0.2"