ci: add go 1.23 and remove go 1.20

Signed-off-by: Chen Su <ghosind@gmail.com>

Author: ghosind

.github/workflows/coverage.yaml

@@ -12,7 +12,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
-        go-version: "1.22"
+        go-version: "1.23"
 
     - name: Test
       run: go test -v ./... -coverprofile=coverage.out

.github/workflows/test.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        go_version: ["1.20", "1.21", "1.22"]
+        go_version: ["1.21", "1.22", "1.23"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps: