ci: fix macOS runner

Apparently Github changed the permissions on /usr/local in the
default image so now we need to use `sudo` for luarocks to be able
to install packages.

While I'm here: update the checkout dependency and use
macOS-latest image instead of multiple old images.

.github/workflows/macos.yml

@@ -4,25 +4,22 @@ on: [push, pull_request]
 
 jobs:
   build:
+    runs-on: macos-latest
     strategy:
       matrix:
-        os:
-          - macos-12
-          - macos-11 # latest
         config:
           - ""
           - --disable-curses
           - --disable-lua
           - --disable-tre
           - --disable-help
-    runs-on: ${{ matrix.os }}
     env:
       CFLAGS_EXTRA: --coverage
       LDFLAGS_EXTRA: --coverage
     steps:
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Dependency Homebrew
       run: |
@@ -36,8 +33,8 @@ jobs:
 
     - name: Dependency LuaRocks
       run: |
-        luarocks install lpeg
-        luarocks install busted
+        sudo luarocks install lpeg
+        sudo luarocks install busted
 
     - name: Build
       run: |