chore: updated go version to 1.21.0 and uploading of plugin as artifact

Author: kevinvalk

.github/workflows/ci.yml

@@ -12,5 +12,9 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-go@v4
       with:
-        go-version: '1.21.0-rc.2'
+        go-version: '1.21.0'
     - run: make
+    - uses: actions/upload-artifact@v3
+      with:
+        name: sqlc-gen-python
+        path: plugin/sqlc-gen-python.wasm