Bump GitHub workflow actions to their latest versions (#22)

This PR bumps GitHub workflow actions to their latest versions.

Author: deining

.github/workflows/test.yml

@@ -9,15 +9,15 @@ jobs:
   build:
     strategy:
       matrix:
-        go-version: [1.17.x]
+        go-version: '1.20'
         os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Test
         run: go test -race -v .