Bump mini_portile2 from 2.8.7 to 2.8.8

Bumps [mini_portile2](https://github.com/flavorjones/mini_portile) from 2.8.7 to 2.8.8.
- [Release notes](https://github.com/flavorjones/mini_portile/releases)
- [Changelog](https://github.com/flavorjones/mini_portile/blob/main/CHANGELOG.md)
- [Commits](flavorjones/mini_portile@v2.8.7...v2.8.8)

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

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

Gemfile.lock

@@ -174,7 +174,7 @@ GEM
       net-smtp
     marcel (1.0.4)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.7)
+    mini_portile2 (2.8.8)
     minitest (5.25.1)
     mocha (2.5.0)
       ruby2_keywords (>= 0.0.5)