update last actions/checkout from v3 to v4

Author: bartekpacia

.github/workflows/test.yml

@@ -31,19 +31,26 @@ jobs:
 
       - name: Set PATH
         run: echo "${GITHUB_WORKSPACE}/.local/bin" >>"${GITHUB_PATH}"
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
+
       - if: matrix.go == '1.20.x' && matrix.os == 'ubuntu-latest'
         run: make ensure-goimports
+
       - if: matrix.go == '1.20.x' && matrix.os == 'ubuntu-latest'
         run: make lint
+
       - run: make vet
       - run: make test
       - run: make check-binary-size
+
       - if: matrix.go == '1.20.x' && matrix.os == 'ubuntu-latest'
         run: make generate
+
       - run: make diffcheck
+
       - if: matrix.go == '1.20.x' && matrix.os == 'ubuntu-latest'
         run: make v3diff
+
       - if: success() && matrix.go == '1.20.x' && matrix.os == 'ubuntu-latest'
         uses: codecov/codecov-action@v4
         with: