workflows: bump checkout, simplify mac/windows.

Explicit Windows target was needed when we were integrating with libpcre
from vcpkg.

Similarly, don't need to brew install pcre any more.

.github/workflows/zig.yml

@@ -8,9 +8,7 @@ jobs:
   test-linux:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: recursive
+      - uses: actions/checkout@v4
       - uses: goto-bus-stop/setup-zig@v2
         with:
           version: 0.12.0
@@ -19,26 +17,21 @@ jobs:
   test-macos:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: recursive
+      - uses: actions/checkout@v4
       - uses: goto-bus-stop/setup-zig@2a9625d550eefc3a9b1a43d342ad655f563f8241
         with:
           version: 0.12.0
-      - run: brew install pcre
       - run: zig build
       - run: zig build test
   test-windows:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: recursive
+      - uses: actions/checkout@v4
       - uses: goto-bus-stop/setup-zig@v2
         with:
           version: 0.12.0
-      - run: zig build -Dtarget=x86_64-windows-msvc
-      - run: zig build -Dtarget=x86_64-windows-msvc test
+      - run: zig build
+      - run: zig build test
   lint:
     runs-on: ubuntu-latest
     steps: