Bump omnibus-software from 67a1705 to 15f86e2 in /omnibus

Bumps [omnibus-software](https://github.com/chef/omnibus-software) from `67a1705` to `15f86e2`.
- [Commits](chef/omnibus-software@67a1705...15f86e2)

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

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

omnibus/Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/chef/omnibus-software.git
-  revision: 67a1705bfa8731ba4eac7b5e62f340d5f08a2952
+  revision: 15f86e201fd15b67008d8f69203b7d520a4a1d0e
   branch: main
   specs:
-    omnibus-software (23.5.290)
+    omnibus-software (23.7.294)
       omnibus (>= 9.0.0)
 
 GIT
@@ -34,14 +34,14 @@ GEM
     artifactory (3.0.15)
     awesome_print (1.9.2)
     aws-eventstream (1.2.0)
-    aws-partitions (1.765.0)
-    aws-sdk-core (3.172.0)
+    aws-partitions (1.785.0)
+    aws-sdk-core (3.178.0)
       aws-eventstream (~> 1, >= 1.0.2)
       aws-partitions (~> 1, >= 1.651.0)
       aws-sigv4 (~> 1.5)
       jmespath (~> 1, >= 1.6.1)
-    aws-sdk-kms (1.64.0)
-      aws-sdk-core (~> 3, >= 3.165.0)
+    aws-sdk-kms (1.71.0)
+      aws-sdk-core (~> 3, >= 3.177.0)
       aws-sigv4 (~> 1.1)
     aws-sdk-s3 (1.116.0)
       aws-sdk-core (~> 3, >= 3.127.0)
@@ -50,7 +50,7 @@ GEM
     aws-sdk-secretsmanager (1.72.0)
       aws-sdk-core (~> 3, >= 3.165.0)
       aws-sigv4 (~> 1.1)
-    aws-sigv4 (1.5.2)
+    aws-sigv4 (1.6.0)
       aws-eventstream (~> 1, >= 1.0.2)
     bcrypt_pbkdf (1.1.0)
     berkshelf (8.0.5)
@@ -258,7 +258,7 @@ GEM
     pry (0.14.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    public_suffix (5.0.1)
+    public_suffix (5.0.3)
     rack (2.2.6.2)
     rainbow (3.1.1)
     rake (13.0.6)
@@ -316,7 +316,7 @@ GEM
     toml-rb (2.2.0)
       citrus (~> 3.0, > 3.0)
     tomlrb (1.3.0)
-    train-core (3.10.7)
+    train-core (3.10.8)
       addressable (~> 2.5)
       ffi (!= 1.13.0)
       json (>= 1.8, < 3.0)