fix: bump flipper from 0.25.4 to 0.26.0

Bumps [flipper](https://github.com/jnunemaker/flipper) from 0.25.4 to 0.26.0.
- [Release notes](https://github.com/jnunemaker/flipper/releases)
- [Changelog](https://github.com/jnunemaker/flipper/blob/main/Changelog.md)
- [Commits](flippercloud/flipper@v0.25.4...v0.26.0)

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

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

Gemfile

@@ -10,7 +10,7 @@ gem 'bcrypt',             '~> 3.1' # Use ActiveModel has_secure_password
 gem 'bootsnap',           '~> 1.15', require: false # Reduces boot times through caching; required in config/boot.rb
 gem 'ddtrace',            '~> 1.5', require: 'ddtrace/auto_instrument' # Datadog's tracing client for Ruby
 gem 'faraday-http-cache', '~> 2.4' # middleware that respects HTTP cache by checking expiration of the stored responses.
-gem 'flipper',            '~> 0.25' # Feature flipper for ANYTHING
+gem 'flipper',            '~> 0.26' # Feature flipper for ANYTHING
 gem 'flipper-redis',      '~> 0.25' # Redis adapter for Flipper
 gem 'flipper-ui',         '~> 0.25' # UI for the Flipper gem
 gem 'graphql-client',     '~> 0.18' # Ruby library for declaring, composing and executing GraphQL queries.

Gemfile.lock

@@ -113,13 +113,14 @@ GEM
       faraday (>= 0.8)
     faraday-net_http (3.0.1)
     ffi (1.15.5)
-    flipper (0.25.4)
-    flipper-redis (0.25.4)
-      flipper (~> 0.25.4)
+    flipper (0.26.0)
+      concurrent-ruby (< 2)
+    flipper-redis (0.26.0)
+      flipper (~> 0.26.0)
       redis (>= 3.0, < 6)
-    flipper-ui (0.25.4)
+    flipper-ui (0.26.0)
       erubi (>= 1.0.0, < 2.0.0)
-      flipper (~> 0.25.4)
+      flipper (~> 0.26.0)
       rack (>= 1.4, < 3)
       rack-protection (>= 1.5.3, <= 4.0.0)
       sanitize (< 7)
@@ -425,7 +426,7 @@ DEPENDENCIES
   capybara
   ddtrace (~> 1.5)
   faraday-http-cache (~> 2.4)
-  flipper (~> 0.25)
+  flipper (~> 0.26)
   flipper-redis (~> 0.25)
   flipper-ui (~> 0.25)
   graphql-client (~> 0.18)