ci: update CI workflows and dependencies for Go and Codecov

- Update Go versions in the workflow to include 1.23 and remove 1.20
- Upgrade Codecov action from v4 to v5

Signed-off-by: appleboy <[email protected]>

Author: appleboy

.github/workflows/go.yml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: ["1.20", 1.21, 1.22]
+        go: [1.21, 1.22, 1.23]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build
@@ -64,6 +64,6 @@ jobs:
           go test -v -covermode=atomic -coverprofile=coverage.out
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           flags: ${{ matrix.os }},go-${{ matrix.go }}