Bump minitest from 5.25.5 to 5.26.0

Bumps [minitest](https://github.com/minitest/minitest) from 5.25.5 to 5.26.0.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.25.5...v5.26.0)

---
updated-dependencies:
- dependency-name: minitest
  dependency-version: 5.26.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -170,7 +170,7 @@ GEM
     matrix (0.4.3)
     method_source (1.1.0)
     mini_mime (1.1.5)
-    minitest (5.25.5)
+    minitest (5.26.0)
     net-imap (0.5.9)
       date
       net-protocol