Update ci.yml

Author: greggh

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Install Lua
         uses: leafo/gh-actions-lua@v9
         with:
-          luaVersion: "5.1"
+          luaVersion: "5.3"
 
       - name: Install LuaRocks
         uses: leafo/gh-actions-luarocks@v4
@@ -99,4 +99,4 @@ jobs:
           ./scripts/test.sh
         continue-on-error: false
 
-# Documentation validation has been moved to the dedicated docs.yml workflow
+# Documentation validation has been moved to the dedicated docs.yml workflow