Bump secure_headers from 6.3.3 to 6.3.4 (#1834)

Bumps [secure_headers](https://github.com/twitter/secureheaders) from 6.3.3 to 6.3.4.
- [Release notes](https://github.com/twitter/secureheaders/releases)
- [Changelog](https://github.com/github/secure_headers/blob/main/CHANGELOG.md)
- [Commits](github/secure_headers@v6.3.3...v6.3.4)

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

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

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

Gemfile

@@ -84,7 +84,7 @@ gem 'rails-i18n', '6.0.0' # Localizations for Rails built-ins
 gem 'redcarpet', '3.5.1' # Process markdown in form textareas (justifications)
 gem 'sass-rails', '5.1.0', require: false # For .scss files (CSS extension)
 gem 'scout_apm', '4.1.2' # Monitor for memory leaks
-gem 'secure_headers', '6.3.3' # Add hardening measures to HTTP headers
+gem 'secure_headers', '6.3.4' # Add hardening measures to HTTP headers
 # WARNING!!!!
 # CHECK DEPLOYMENT FIRST IF YOU UPDATE sprockets-rails.
 # The gem sprockets-rails version 3.4.1 (from 3.2.2) caused a regression

Gemfile.lock

@@ -405,7 +405,7 @@ GEM
       faraday (>= 0.17.3, < 3)
     scout_apm (4.1.2)
       parser
-    secure_headers (6.3.3)
+    secure_headers (6.3.4)
     selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
@@ -538,7 +538,7 @@ DEPENDENCIES
   ruby-graphviz (= 1.2.5)
   sass-rails (= 5.1.0)
   scout_apm (= 4.1.2)
-  secure_headers (= 6.3.3)
+  secure_headers (= 6.3.4)
   selenium-webdriver (= 3.142.7)
   spring (= 4.0.0)
   sprockets-rails (= 3.4.2)