Pin serverless version.

Author: purple4reina

.github/workflows/build.yml

@@ -61,7 +61,7 @@ jobs:
           key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
 
       - name: Install Serverless Framework
-        run: sudo yarn global add serverless --prefix /usr/local
+        run: sudo yarn global add serverless@^3.38.0 --prefix /usr/local
 
       - name: Install dependencies
         if: steps.cache-node-modules.outputs.cache-hit != 'true'