chore(deps): update leafo/gh-actions-luarocks action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
           luaVersion: "luajit-openresty"
 
       - name: luarocks
-        uses: leafo/gh-actions-luarocks@v5
+        uses: leafo/gh-actions-luarocks@v6
 
       - name: run test
         shell: bash