Update actions/setup-go action to v4 (#26)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/codetests.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v4
         with:
           go-version: 1.19
       - name: go-test
@@ -29,7 +29,7 @@ jobs:
     env:
       GOOS: ${{ matrix.os }}
     steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v4
         with:
           go-version: 1.19
       - uses: actions/checkout@v3
@@ -47,7 +47,7 @@ jobs:
     env:
       GOOS: ${{ matrix.os }}
     steps:
-      - uses: actions/setup-go@v3
+      - uses: actions/setup-go@v4
         with:
           go-version: 1.19
       - uses: actions/checkout@v3