Bump dotenv-rails from 2.6.0 to 2.8.1

Bumps [dotenv-rails](https://github.com/bkeepers/dotenv) from 2.6.0 to 2.8.1.
- [Release notes](https://github.com/bkeepers/dotenv/releases)
- [Changelog](https://github.com/bkeepers/dotenv/blob/master/Changelog.md)
- [Commits](bkeepers/dotenv@v2.6.0...v2.8.1)

---
updated-dependencies:
- dependency-name: dotenv-rails
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -16,7 +16,7 @@ gem 'newrelic_rpm'
 gem 'active_interaction', "~> 3.6"
 gem 'faraday-panoptes', "~> 0.3"
 gem 'panoptes-client', "~> 0.3"
-gem 'dotenv-rails', "~> 2.6"
+gem 'dotenv-rails', "~> 2.8"
 
 group :development, :test do
   gem 'byebug', "~> 10.0"

Gemfile.lock

@@ -73,16 +73,16 @@ GEM
     celluloid-supervision (0.20.6)
       timers (>= 4.1.1)
     coderay (1.1.2)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     connection_pool (2.2.5)
     crass (1.0.6)
     database_cleaner (1.7.0)
     diff-lcs (1.3)
-    dotenv (2.6.0)
-    dotenv-rails (2.6.0)
-      dotenv (= 2.6.0)
-      railties (>= 3.2, < 6.0)
-    erubi (1.10.0)
+    dotenv (2.8.1)
+    dotenv-rails (2.8.1)
+      dotenv (= 2.8.1)
+      railties (>= 3.2)
+    erubi (1.12.0)
     factory_girl (4.9.0)
       activesupport (>= 3.0.0)
     factory_girl_rails (4.9.0)
@@ -113,20 +113,20 @@ GEM
     logstasher (2.1.5)
       activesupport (>= 5.2)
       request_store
-    loofah (2.19.1)
+    loofah (2.20.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     marcel (1.0.2)
     method_source (0.9.2)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.0)
-    minitest (5.17.0)
+    mini_portile2 (2.8.1)
+    minitest (5.18.0)
     multipart-post (2.1.1)
     newrelic_rpm (4.7.1.340)
     nio4r (2.5.8)
-    nokogiri (1.13.10)
+    nokogiri (1.14.2)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     panoptes-client (0.3.8)
@@ -144,13 +144,13 @@ GEM
       pry (>= 0.10.4)
     puma (5.6.4)
       nio4r (~> 2.0)
-    racc (1.6.1)
+    racc (1.6.2)
     rack (2.2.6.4)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
     rack-protection (2.2.0)
       rack
-    rack-test (2.0.2)
+    rack-test (2.1.0)
       rack (>= 1.3)
     rails (5.2.8.1)
       actioncable (= 5.2.8.1)
@@ -168,7 +168,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.4)
+    rails-html-sanitizer (1.5.0)
       loofah (~> 2.19, >= 2.19.1)
     railties (5.2.8.1)
       actionpack (= 5.2.8.1)
@@ -220,7 +220,7 @@ GEM
     thread_safe (0.3.6)
     timers (4.1.2)
       hitimes
-    tzinfo (1.2.10)
+    tzinfo (1.2.11)
       thread_safe (~> 0.1)
     web-console (3.7.0)
       actionview (>= 5.0)
@@ -239,7 +239,7 @@ DEPENDENCIES
   active_model_serializers (~> 0.10)
   byebug (~> 10.0)
   database_cleaner (~> 1.7)
-  dotenv-rails (~> 2.6)
+  dotenv-rails (~> 2.8)
   factory_girl_rails (~> 4.8)
   faraday-detailed_logger (~> 2.5)
   faraday-panoptes (~> 0.3)