build: Fix RPM spec file macro recursion error

- Add conditional default version definition to prevent circular macro reference
- The Version tag was set to %{version} which created infinite recursion
- Now uses %{!?version:%define version 5.1.0} to provide a default
- This allows rpmbuild to override with --define "version X.Y.Z" from CI
- Tested with rpm --define "version 5.1.1.dev1" -q --specfile

Co-authored-by: alvarolopez <[email protected]>

Author: Copilot

packaging/redhat/caso.spec

@@ -1,3 +1,4 @@
+%{!?version:%define version 5.1.0}
 Name:        caso
 Version:     %{version}
 Release:     1%{?dist}