build(deps): bump pagy from 5.10.1 to 7.0.0 in /backend

Bumps [pagy](https://github.com/ddnexus/pagy) from 5.10.1 to 7.0.0.
- [Release notes](https://github.com/ddnexus/pagy/releases)
- [Changelog](https://github.com/ddnexus/pagy/blob/master/CHANGELOG.md)
- [Commits](ddnexus/pagy@5.10.1...7.0.0)

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

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

backend/Gemfile.lock

@@ -342,7 +342,7 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.1.2)
     mini_portile2 (2.8.5)
-    minitest (5.21.2)
+    minitest (5.22.2)
     msgpack (1.5.1)
     multi_json (1.15.0)
     multipart-post (2.1.1)
@@ -366,8 +366,7 @@ GEM
     optimist (3.0.1)
     orm_adapter (0.5.0)
     os (1.1.4)
-    pagy (5.10.1)
-      activesupport
+    pagy (7.0.0)
     parallel (1.22.1)
     parser (3.1.2.0)
       ast (~> 2.4.1)