ci: Test against Lua 5.4 (#27)

Author: alerque

.github/workflows/busted.yml

@@ -7,15 +7,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        luaVersion: ["5.3", "5.2", "5.1", "luajit", "luajit-openresty"]
+        luaVersion: ["5.4", "5.3", "5.2", "5.1", "luajit", "luajit-openresty"]
 
     runs-on: ubuntu-latest
 
     steps:
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@v2
     - name: Setup Lua
-      uses: leafo/gh-actions-lua@v5
+      uses: leafo/gh-actions-lua@v6
       with:
         luaVersion: ${{ matrix.luaVersion }}
     - name: Setup Lua Rocks