Bump nokogiri from 1.16.0 to 1.16.2 in /backend

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.16.0 to 1.16.2.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.16.0...v1.16.2)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

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

Author: dependabot[bot]

backend/Gemfile.lock

@@ -266,14 +266,14 @@ GEM
       net-protocol
     nio4r (2.7.0)
     nio4r (2.7.0-java)
-    nokogiri (1.16.0)
+    nokogiri (1.16.2)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.16.0-java)
+    nokogiri (1.16.2-java)
       racc (~> 1.4)
-    nokogiri (1.16.0-x64-mingw32)
+    nokogiri (1.16.2-x64-mingw32)
       racc (~> 1.4)
-    nokogiri (1.16.0-x86-mingw32)
+    nokogiri (1.16.2-x86-mingw32)
       racc (~> 1.4)
     oauth2 (1.4.7)
       faraday (>= 0.8, < 2.0)