chore: Bump Lua version used in linter

.github/workflows/luacheck.yml

@@ -3,24 +3,17 @@ name: Luacheck
 on: [push, pull_request]
 
 jobs:
-  luacheck:
-    runs-on: ubuntu-latest
 
+  luacheck:
+    runs-on: ubuntu-20.04
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
-
-    - name: Setup Lua
-      uses: leafo/gh-actions-lua@v8
-      with:
-        luaVersion: 5.4
-
-    - name: Setup Lua Rocks
+      uses: actions/checkout@v3
+    - name: Setup ‘lua’
+      uses: leafo/gh-actions-lua@v9
+    - name: Setup ‘luarocks’
       uses: leafo/gh-actions-luarocks@v4
-
-    - name: Setup dependencies
+    - name: Setup ‘luacheck’
       run: luarocks install luacheck
-
-    - name: Run Code Linter
-      run: |
-        luacheck .
+    - name: Run ‘luacheck’ linter
+      run: luacheck .