Bump omnibus-software from 4cac921 to 2776450 in /omnibus

Bumps [omnibus-software](https://github.com/chef/omnibus-software) from `4cac921` to `2776450`.
- [Release notes](https://github.com/chef/omnibus-software/releases)
- [Commits](chef/omnibus-software@4cac921...2776450)

---
updated-dependencies:
- dependency-name: omnibus-software
  dependency-type: direct:production
...

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

omnibus/Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/chef/omnibus-software.git
-  revision: 4cac921da85329b9bb897769e26a2868ebd2dd59
+  revision: 27764506587cf980786ef00e9e9f82a180ec8a6a
   branch: main
   specs:
     omnibus-software (4.0.0)
@@ -34,7 +34,7 @@ GEM
     ast (2.4.2)
     awesome_print (1.9.2)
     aws-eventstream (1.2.0)
-    aws-partitions (1.534.0)
+    aws-partitions (1.535.0)
     aws-sdk-core (3.123.0)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.525.0)