Bump groupdate from 5.0.0 to 5.1.0

Bumps [groupdate](https://github.com/ankane/groupdate) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/ankane/groupdate/releases)
- [Changelog](https://github.com/ankane/groupdate/blob/master/CHANGELOG.md)
- [Commits](ankane/groupdate@v5.0.0...v5.1.0)

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

Author: dependabot-preview[bot]

Gemfile

@@ -23,7 +23,7 @@ gem "font-awesome-rails"
 gem "font-ionicons-rails"
 gem "fullcalendar-rails"
 gem "geocoder"
-gem "groupdate", "~> 5.0"
+gem "groupdate", "~> 5.1"
 gem "image_processing"
 gem "jbuilder"
 gem "jquery-rails"

Gemfile.lock

@@ -187,7 +187,7 @@ GEM
     geocoder (1.6.3)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    groupdate (5.0.0)
+    groupdate (5.1.0)
       activesupport (>= 5)
     guard (2.15.1)
       formatador (>= 0.2.4)
@@ -540,7 +540,7 @@ DEPENDENCIES
   font-ionicons-rails
   fullcalendar-rails
   geocoder
-  groupdate (~> 5.0)
+  groupdate (~> 5.1)
   guard-rspec
   image_processing
   jbuilder