Bump parallel from 1.20.0 to 1.20.1 (#15204)

Bumps [parallel](https://github.com/grosser/parallel) from 1.20.0 to 1.20.1.
- [Release notes](https://github.com/grosser/parallel/releases)
- [Commits](https://github.com/grosser/parallel/compare/v1.20.0...v1.20.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -391,7 +391,7 @@ GEM
     paperclip-av-transcoder (0.6.4)
       av (~> 0.9.0)
       paperclip (>= 2.5.2)
-    parallel (1.20.0)
+    parallel (1.20.1)
     parallel_tests (3.4.0)
       parallel
     parser (2.7.2.0)