Upgrade: Bump flipper-ui from 1.3.0 to 1.3.1

Bumps [flipper-ui](https://github.com/flippercloud/flipper) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/flippercloud/flipper/releases)
- [Changelog](https://github.com/flippercloud/flipper/blob/main/Changelog.md)
- [Commits](flippercloud/flipper@v1.3.0...v1.3.1)

---
updated-dependencies:
- dependency-name: flipper-ui
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -192,14 +192,14 @@ GEM
     ffi-compiler (1.3.2)
       ffi (>= 1.15.5)
       rake
-    flipper (1.3.0)
+    flipper (1.3.1)
       concurrent-ruby (< 2)
     flipper-active_record (1.3.0)
       activerecord (>= 4.2, < 8)
       flipper (~> 1.3.0)
-    flipper-ui (1.3.0)
+    flipper-ui (1.3.1)
       erubi (>= 1.0.0, < 2.0.0)
-      flipper (~> 1.3.0)
+      flipper (~> 1.3.1)
       rack (>= 1.4, < 4)
       rack-protection (>= 1.5.3, < 5.0.0)
       rack-session (>= 1.0.2, < 3.0.0)
@@ -504,7 +504,7 @@ GEM
     rubocop-rspec_rails (2.29.1)
       rubocop (~> 1.61)
     ruby-progressbar (1.13.0)
-    sanitize (6.1.2)
+    sanitize (6.1.3)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     sawyer (0.9.2)