Bump jwt from 2.7.1 to 2.8.0

Bumps [jwt](https://github.com/jwt/ruby-jwt) from 2.7.1 to 2.8.0.
- [Release notes](https://github.com/jwt/ruby-jwt/releases)
- [Changelog](https://github.com/jwt/ruby-jwt/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jwt/ruby-jwt/compare/v2.7.1...v2.8.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -206,7 +206,8 @@ GEM
       hana (~> 1.3)
       regexp_parser (~> 2.0)
       simpleidn (~> 0.2)
-    jwt (2.7.1)
+    jwt (2.8.0)
+      base64
     kaminari (1.2.2)
       activesupport (>= 4.1.0)
       kaminari-actionview (= 1.2.2)