ci: Update Luacheck to v1+, use newer Ubuntu runner images

Author: alerque

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         luaVersion: [ "5.4", "5.3", "5.2", "5.1", "luajit", "luajit-openresty" ]
-        platform: [ "ubuntu-20.04", "macos-11", "windows-2022" ]
+        platform: [ "ubuntu-22.04", "macos-11", "windows-2022" ]
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Checkout

.github/workflows/luacheck.yml

@@ -5,9 +5,9 @@ on: [push, pull_request]
 jobs:
 
   luacheck:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Luacheck
-        uses: lunarmodules/luacheck@v0
+        uses: lunarmodules/luacheck@v1