Bump mixlib-shellout in /src/supermarket/engines/fieri (#2666)

Bumps [mixlib-shellout](https://github.com/chef/mixlib-shellout) from 3.2.5 to 3.2.6.
- [Release notes](https://github.com/chef/mixlib-shellout/releases)
- [Changelog](https://github.com/chef/mixlib-shellout/blob/main/CHANGELOG.md)
- [Commits](chef/mixlib-shellout@v3.2.5...v3.2.6)

---
updated-dependencies:
- dependency-name: mixlib-shellout
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

src/supermarket/engines/fieri/Gemfile.lock

@@ -74,12 +74,12 @@ GEM
       public_suffix (>= 2.0.2, < 5.0)
     ast (2.4.2)
     builder (3.2.4)
-    chef-utils (17.9.52)
+    chef-utils (17.10.0)
       concurrent-ruby
     chefstyle (2.2.2)
       rubocop (= 1.25.1)
     coderay (1.1.3)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.1.10)
     connection_pool (2.2.5)
     cookstyle (7.32.1)
       rubocop (= 1.25.1)
@@ -133,7 +133,7 @@ GEM
     mixlib-archive (1.1.7)
       mixlib-log
     mixlib-log (3.0.9)
-    mixlib-shellout (3.2.5)
+    mixlib-shellout (3.2.6)
       chef-utils
     multipart-post (2.1.1)
     nio4r (2.5.8)