fix state index for `CAOpSetRootsAndConfig` op (#10675)

* fix state index for `CAOpSetRootsAndConfig` op

* add changelog

* Update changelog

Co-authored-by: Daniel Nephin <dnephin@hashicorp.com>

* remove the change log as it's not needed

Co-authored-by: Daniel Nephin <dnephin@hashicorp.com>

agent/consul/fsm/commands_oss.go

@@ -462,7 +462,7 @@ func (c *FSM) applyConnectCAOperation(buf []byte, index uint64) interface{} {
 			return act
 		}
 
-		act, err = c.state.CACheckAndSetConfig(index+1, req.Config.ModifyIndex, req.Config)
+		act, err = c.state.CACheckAndSetConfig(index, req.Config.ModifyIndex, req.Config)
 		if err != nil {
 			return err
 		}