Bump ruby-vips from 2.1.4 to 2.2.0 (#456)

Bumps [ruby-vips](https://github.com/libvips/ruby-vips) from 2.1.4 to 2.2.0.
- [Changelog](https://github.com/libvips/ruby-vips/blob/master/CHANGELOG.md)
- [Commits](libvips/ruby-vips@v2.1.4...v2.2.0)

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

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

Gemfile.lock

@@ -145,7 +145,7 @@ GEM
       railties (>= 5.0.0)
     faker (3.2.1)
       i18n (>= 1.8.11, < 2)
-    ffi (1.15.5)
+    ffi (1.16.3)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
       rake
@@ -361,7 +361,7 @@ GEM
     ruby-graphviz (1.2.5)
       rexml
     ruby-progressbar (1.13.0)
-    ruby-vips (2.1.4)
+    ruby-vips (2.2.0)
       ffi (~> 1.12)
     ruby_http_client (3.5.5)
     rubyzip (2.3.2)