Bump mini_portile2 from 2.8.0 to 2.8.1

Bumps [mini_portile2](https://github.com/flavorjones/mini_portile) from 2.8.0 to 2.8.1.
- [Release notes](https://github.com/flavorjones/mini_portile/releases)
- [Changelog](https://github.com/flavorjones/mini_portile/blob/main/CHANGELOG.md)
- [Commits](https://github.com/flavorjones/mini_portile/compare/v2.8.0...v2.8.1)

---
updated-dependencies:
- dependency-name: mini_portile2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -401,7 +401,7 @@ GEM
       rake
     mini_magick (4.11.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.1)
     mini_racer (0.4.0)
       libv8-node (~> 15.14.0.0)
     minitest (5.16.3)