chore: update to use go1.21.1

Signed-off-by: Rui Chen <rui@chenrui.dev>

Author: chenrui333

.github/workflows/windows-validation.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         cache: [false, true]
-        go: [1.20.1]
+        go: [1.21.1]
     steps:
       - uses: actions/checkout@v4
 
@@ -119,7 +119,7 @@ jobs:
     strategy:
       matrix:
         cache: [false]
-        go: [1.20.1]
+        go: [1.21.1]
     steps:
       - uses: actions/checkout@v4