Update CI workflow for luacheck

Author: alerque

.github/workflows/luacheck.yml

@@ -9,11 +9,13 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Setup Lua
-      uses: leafo/gh-actions-lua@v7
-    - name: Setup Luarocks
-      uses: leafo/gh-actions-luarocks@v3
-    - name: Install luacheck
+    - name: Setup ‘lua’
+      uses: leafo/gh-actions-lua@v8
+      with:
+        luaVersion: 5.3
+    - name: Setup ‘luarocks’
+      uses: leafo/gh-actions-luarocks@v4
+    - name: Setup ‘luacheck’
       run: luarocks install luacheck
-    - name: Lint all the Lua code
+    - name: Run ‘luacheck’ linter
       run: luacheck .