Upgrade to Go 1.21 in Github Actions

Author: Ninju

.github/workflows/push.yaml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.17"
+          go-version: "1.21"
       - run: make test
   build:
     runs-on: ubuntu-latest
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.17"
+          go-version: "1.21"
       - run: make build
       - uses: actions/upload-artifact@v4
         with: