Use Go 1.23

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

.github/workflows/ci.yml

@@ -12,12 +12,12 @@ concurrency:
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.20
+          go-version: '1.23'
         id: go
 
       - uses: actions/checkout@v2