Update CI.

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
       - name: Install Go
         uses: actions/setup-go@v4
         with:
-          go-version: 1.20.x
+          go-version: 1.23.x
 
       - name: Install tools
         run: |
@@ -36,19 +36,19 @@ jobs:
   test:
     strategy:
       matrix:
-        go: ['1.18', '1.19', '1.20']
+        go: ['1.23', '1.22', '1.21']
     name: test @ Go ${{ matrix.go }}
     runs-on: ubuntu-latest
     steps:
     - name: Install Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}
 
     - name: Checkout code
       uses: actions/checkout@v4
 
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-build-${{ hashFiles('**/go.sum') }}