fix: correct backtick escaping in vendor summary table

Author: Copilot

.github/workflows/vendor.yml

@@ -97,7 +97,7 @@ jobs:
               }
 
               $listUpdated += "$($s.name) v$($s.version), "
-              $updateMessage += "| $emoji **[$($s.name)]($repoUrl)** | \`$oldVersion\` | **\`$($s.version)\`** |`n"
+              $updateMessage += "| $emoji **[$($s.name)]($repoUrl)** | ``$oldVersion`` | **``$($s.version)``** |`n"
             }
           }