Update dependency org.openvoxproject:ring-middleware to v2.1.8

Author: renovate[bot]

project.clj

@@ -29,7 +29,7 @@
                          [org.openvoxproject/jruby-deps "9.4.12.1-3"]
                          [org.openvoxproject/kitchensink "3.5.7"]
                          [org.openvoxproject/kitchensink "3.5.7" :classifier "test"]
-                         [org.openvoxproject/ring-middleware "2.1.7"]
+                         [org.openvoxproject/ring-middleware "2.1.8"]
                          [org.openvoxproject/trapperkeeper "4.3.5"]
                          [org.openvoxproject/trapperkeeper "4.3.5" :classifier "test"]
                          [org.tcrawley/dynapath "1.1.0"]