Init the debugger at the end to avoid concurrent middleware loading

cider.el

@@ -892,10 +892,15 @@ buffer."
     (cider--check-required-nrepl-version)
     (cider--check-clojure-version-supported)
     (cider--check-middleware-compatibility)
-    (cider--debug-init-connection)
     (cider--subscribe-repl-to-server-out)
     (when cider-auto-mode
       (cider-enable-on-existing-clojure-buffers))
+    ;; Middleware on cider-nrepl side is differed until first usage, but,
+    ;; loading middleware concurrently can lead to occasional "require" issues
+    ;; (likely a clojure bug). Thus, we load the heavy debug middleware towards
+    ;; the end, allowing for the faster "server-out" middleware to load
+    ;; first.
+    (cider--debug-init-connection)
     (run-hooks 'cider-connected-hook)))
 
 (defun cider--disconnected-handler ()