Bump flipper from 0.20.1 to 0.20.3 (#2118)

Bumps [flipper](https://github.com/jnunemaker/flipper) from 0.20.1 to 0.20.3.
- [Release notes](https://github.com/jnunemaker/flipper/releases)
- [Changelog](https://github.com/jnunemaker/flipper/blob/master/Changelog.md)
- [Commits](flippercloud/flipper@v0.20.1...v0.20.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -166,7 +166,7 @@ GEM
       redis (~> 4.1)
     ffi (1.14.2)
     filterrific (5.2.1)
-    flipper (0.20.1)
+    flipper (0.20.3)
     flipper-active_record (0.20.1)
       activerecord (>= 5.0, < 7)
       flipper (~> 0.20.1)