Bump parallel_tests from 2.26.0 to 2.26.2 (#9154)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 2.26.0 to 2.26.2.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Commits](https://github.com/grosser/parallel_tests/compare/v2.26.0...v2.26.2)

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

Gemfile.lock

@@ -387,7 +387,7 @@ GEM
       av (~> 0.9.0)
       paperclip (>= 2.5.2)
     parallel (1.12.1)
-    parallel_tests (2.26.0)
+    parallel_tests (2.26.2)
       parallel
     parser (2.5.3.0)
       ast (~> 2.4.0)