Bump mongoid from 8.1.7 to 9.0.3

Bumps [mongoid](https://github.com/mongodb/mongoid) from 8.1.7 to 9.0.3.
- [Release notes](https://github.com/mongodb/mongoid/releases)
- [Changelog](https://github.com/mongodb/mongoid/blob/master/CHANGELOG.md)
- [Commits](mongodb/mongoid@v8.1.7...v9.0.3)

---
updated-dependencies:
- dependency-name: mongoid
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -249,11 +249,10 @@ GEM
     minitest (5.25.2)
     mongo (2.21.0)
       bson (>= 4.14.1, < 6.0.0)
-    mongoid (8.1.7)
+    mongoid (9.0.3)
       activemodel (>= 5.1, < 8.1, != 7.0.0)
       concurrent-ruby (>= 1.0.5, < 2.0)
       mongo (>= 2.18.0, < 3.0.0)
-      ruby2_keywords (~> 0.0.5)
     mongoid-grid_fs (2.6.0)
       mime-types (>= 1.0, < 4.0)
       mongoid (>= 3.0, < 10.0)
@@ -670,7 +669,6 @@ GEM
     ruby-vips (2.2.2)
       ffi (~> 1.12)
       logger
-    ruby2_keywords (0.0.5)
     securerandom (0.3.2)
     sentry-rails (5.21.0)
       railties (>= 5.0)