Update CI config

* Build with a few different versions of Go.
* Fix "go" executable not being found.
* Update actions/checkout to v4.

.github/workflows/ci.yaml

@@ -3,19 +3,30 @@ on: [push, pull_request]
 
 jobs:
   build:
+    runs-on: ${{ matrix.image }}
     strategy:
       matrix:
         image:
-          - macos-latest
-          - ubuntu-latest
-          - windows-latest
-    runs-on: ${{ matrix.image }}
+          - macos-13 # x86_64 support needed for old versions of Go
+          - ubuntu-22.04
+          - windows-2022
+        go:
+          - '1.23'
+          - '1.14' # Made -mod=vendor default
+          - '1.13' # Earliest version we officially support
+    name: Build (${{ matrix.image }}, go ${{ matrix.go }})
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install dependencies
         if: runner.os == 'Linux'
         run: sudo apt-get update && sudo apt-get install -y libwebkit2gtk-4.0-dev
+      - uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go }}
       - name: Build examples
-        run: go build ./examples/basic ./examples/bind
+        run: >
+          go build
+          ./examples/basic
+          ./examples/bind
       - name: Run tests
         run: go test