chore(deps): bump secure_headers from 6.5.0 to 7.3.0

Bumps [secure_headers](https://github.com/github/secure_headers) from 6.5.0 to 7.3.0.
- [Release notes](https://github.com/github/secure_headers/releases)
- [Changelog](https://github.com/github/secure_headers/blob/main/CHANGELOG.md)
- [Commits](https://github.com/github/secure_headers/compare/v6.5.0...v7.3.0)

---
updated-dependencies:
- dependency-name: secure_headers
  dependency-version: 7.3.0
  dependency-type: direct:production
...

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

Gemfile.lock

@@ -382,7 +382,8 @@ GEM
       sprockets (> 3.0)
       sprockets-rails
       tilt
-    secure_headers (6.5.0)
+    secure_headers (7.3.0)
+      cgi (>= 0.1)
     securerandom (0.4.1)
     sentry-rails (5.16.1)
       railties (>= 5.0)