Bump css_parser from 1.19.1 to 1.21.0

Bumps [css_parser](https://github.com/premailer/css_parser) from 1.19.1 to 1.21.0.
- [Changelog](https://github.com/premailer/css_parser/blob/master/CHANGELOG.md)
- [Commits](premailer/css_parser@v1.19.1...v1.21.0)

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

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

Gemfile

@@ -108,7 +108,7 @@ gem 'httparty', '~> 0.22.0'
 gem 'slack-notifier', '~> 2.4.0'
 
 # css styles for emails
-gem 'css_parser', '~> 1.19.1' # dependency for premailer, set to higher version for ruby 3.3 support
+gem 'css_parser', '~> 1.21.0' # dependency for premailer, set to higher version for ruby 3.3 support
 gem 'nokogiri', '~> 1.17.2'
 gem 'premailer-rails', '~> 1.12.0'
 

Gemfile.lock

@@ -137,7 +137,7 @@ GEM
       bigdecimal
       rexml
     crass (1.0.6)
-    css_parser (1.19.1)
+    css_parser (1.21.0)
       addressable
     cssbundling-rails (1.4.1)
       railties (>= 6.0.0)
@@ -582,7 +582,7 @@ DEPENDENCIES
   capistrano3-delayed-job (~> 1.7.6)
   capybara (~> 3.40.0)
   counter_culture (~> 3.8)
-  css_parser (~> 1.19.1)
+  css_parser (~> 1.21.0)
   cssbundling-rails (~> 1.4.1)
   dalli (~> 3.2.8)
   datadog (~> 2.8.0)