build: Upgrade to sqlc 1.28.0

Author: kyleconroy

.github/workflows/ci.yml

@@ -12,11 +12,11 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-go@v5
       with:
-        go-version: '1.21'
+        go-version: '1.23.5'
     # - run: go install github.com/sqlc-dev/sqlc/cmd/sqlc@main
     - uses: sqlc-dev/setup-sqlc@v4
       with:
-        sqlc-version: '1.26.0'
+        sqlc-version: '1.28.0'
     - run: make
     - run: sqlc diff
       working-directory: examples