Use Go 1.23

Signed-off-by: 1gtm <1gtm@appscode.com>

.github/workflows/ci.yml

@@ -13,14 +13,14 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v2
 
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: '1.20'
+          go-version: '1.23'
 
       - name: Build
         run: go build -v ./...