Bump marcel from 1.0.2 to 1.0.3

Bumps [marcel](https://github.com/rails/marcel) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/rails/marcel/releases)
- [Commits](rails/marcel@v1.0.2...v1.0.3)

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

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

Gemfile.lock

@@ -145,7 +145,7 @@ GEM
       net-imap
       net-pop
       net-smtp
-    marcel (1.0.2)
+    marcel (1.0.3)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
     minitest (5.22.2)