chore(zsh-syntax-highlighting): update to e6683f20 (#14175)

Co-authored-by: ohmyzsh[bot] <54982679+ohmyzsh[bot]@users.noreply.github.com>

.github/dependencies.yml

@@ -75,7 +75,7 @@ dependencies:
   plugins/zsh-syntax-highlighting:
     repo: zsh-users/zsh-syntax-highlighting
     branch: master
-    version: 2fc57d63067c18b1100ecdbf684fa5baf49459d1
+    version: e6683f20e5c38d3e5447f45845d04ddda75d0f23
     precopy: |
       set -e
       version=$(<.version)

plugins/zsh-syntax-highlighting/highlighters/main/main-highlighter.zsh

@@ -1240,9 +1240,14 @@ _zsh_highlight_main_highlighter_check_path()
   fi
   tmp_path=$tmp_path:a
 
+  local candidate_new_tmp_path
   while [[ $tmp_path != / ]]; do
     [[ -n ${(M)ZSH_HIGHLIGHT_DIRS_BLACKLIST:#$tmp_path} ]] && return 1
-    tmp_path=$tmp_path:h
+    candidate_new_tmp_path=${tmp_path:h}
+    if [[ $candidate_new_tmp_path == $tmp_path ]]; then
+      break
+    fi
+    tmp_path=${candidate_new_tmp_path}
   done
 
   if (( in_command_position )); then