Bump caxlsx from 3.0.2 to 3.0.4

Bumps [caxlsx](https://github.com/caxlsx/caxlsx) from 3.0.2 to 3.0.4.
- [Release notes](https://github.com/caxlsx/caxlsx/releases)
- [Changelog](https://github.com/caxlsx/caxlsx/blob/master/CHANGELOG.md)
- [Commits](https://github.com/caxlsx/caxlsx/compare/v3.0.2...v.3.0.4)

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

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

Gemfile.lock

@@ -128,7 +128,7 @@ GEM
       rexml (>= 3.2)
       selenium-webdriver (~> 3.0)
       webrick (>= 1.7)
-    caxlsx (3.0.2)
+    caxlsx (3.0.4)
       htmlentities (~> 4.3, >= 4.3.4)
       mimemagic (~> 0.3)
       nokogiri (~> 1.10, >= 1.10.4)
@@ -719,7 +719,7 @@ DEPENDENCIES
   capistrano3-puma (~> 5.0.4)
   capybara (~> 3.35.3)
   capybara-webmock (~> 0.6.0)
-  caxlsx (~> 3.0.2)
+  caxlsx (~> 3.0.4)
   caxlsx_rails (~> 0.6.2)
   ckeditor (~> 4.3.0)
   cocoon (~> 1.2.15)