Bump rubocop from 1.25.1 to 1.26.0 (#2347)

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.25.1 to 1.26.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.25.1...v1.26.0)

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

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

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

Gemfile

@@ -23,7 +23,7 @@ gem 'espeak-ruby', '>= 1.0.4' # Text-to-Voice
 gem 'rake', '>= 12.3.3'
 gem 'otr-activerecord', '>= 1.4.2'
 gem 'sqlite3'
-gem 'rubocop', '~> 1.25.1', require: false
+gem 'rubocop', '~> 1.26.0', require: false
 
 # Geolocation support
 group :geoip do

Gemfile.lock

@@ -114,7 +114,7 @@ GEM
       hashie-forbidden_attributes (~> 0.1)
     parallel (1.21.0)
     parseconfig (1.1.2)
-    parser (3.1.0.0)
+    parser (3.1.1.0)
       ast (~> 2.4.1)
     power_assert (2.0.1)
     pry (0.13.1)
@@ -163,17 +163,17 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    rubocop (1.25.1)
+    rubocop (1.26.0)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml
-      rubocop-ast (>= 1.15.1, < 2.0)
+      rubocop-ast (>= 1.16.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.15.2)
-      parser (>= 3.0.1.1)
+    rubocop-ast (1.16.0)
+      parser (>= 3.1.1.0)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
@@ -281,7 +281,7 @@ DEPENDENCIES
   rdoc
   rest-client (>= 2.0.1)
   rspec
-  rubocop (~> 1.25.1)
+  rubocop (~> 1.26.0)
   rubyzip (>= 1.2.2)
   rushover
   selenium-webdriver