ci(deps): update CI workflows and Codecov action version

- Remove support for Go versions 1.20 and 1.21 in the GitHub Actions workflow
- Update Codecov action from version 4 to version 5

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

.github/workflows/go.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        go: ["1.20", 1.21, 1.22, 1.23]
+        go: [1.22, 1.23]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build
@@ -76,6 +76,6 @@ jobs:
           go test -v -run=^$ -count 5 -benchmem -bench . ./...
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           flags: ${{ matrix.os }},go-${{ matrix.go }}