fix: restore Go version to 1.23.9 to match Dockerfile

Signed-off-by: tsanders <[email protected]>

Author: tsanders-rh

go.mod

@@ -1,6 +1,6 @@
 module github.com/konveyor-ecosystem/kantra
 
-go 1.24.0
+go 1.23.9
 
 require (
 	github.com/cloudfoundry/go-cfclient/v3 v3.0.0-alpha.12.0.20250712142925-13a7dc5466ad