Update Go version in push-test workflow

Author: ako

.github/workflows/push-test.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go-version: ['1.22', '1.23']
+        go-version: ['1.26']
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v4