Bump jwt from 2.3.0 to 2.8.1

Bumps [jwt](https://github.com/jwt/ruby-jwt) from 2.3.0 to 2.8.1.
- [Release notes](https://github.com/jwt/ruby-jwt/releases)
- [Changelog](https://github.com/jwt/ruby-jwt/blob/main/CHANGELOG.md)
- [Commits](jwt/ruby-jwt@v2.3.0...v2.8.1)

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

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

Gemfile

@@ -13,7 +13,7 @@ gem 'puma', '~> 6.4'
 # Admin interface
 gem 'administrate', '~> 0.15'
 # JSON Web Tokens
-gem 'jwt', '~> 2.2'
+gem 'jwt', '~> 2.8'
 # HTTP/REST API client library.
 gem 'faraday_middleware', '~> 1.0'
 # Cache HTTP responses

Gemfile.lock

@@ -75,6 +75,7 @@ GEM
     ast (2.4.2)
     attr_encrypted (3.1.0)
       encryptor (~> 3.0.0)
+    base64 (0.2.0)
     bindex (0.8.1)
     brakeman (5.2.1)
     builder (3.2.4)
@@ -137,7 +138,8 @@ GEM
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    jwt (2.3.0)
+    jwt (2.8.1)
+      base64
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.2)
@@ -305,7 +307,7 @@ DEPENDENCIES
   faraday-http-cache (~> 2.0)
   faraday_middleware (~> 1.0)
   ffaker
-  jwt (~> 2.2)
+  jwt (~> 2.8)
   pg (>= 0.18, < 2.0)
   puma (~> 6.4)
   rails (~> 6.1, >= 6.1.3.1)