Pin module versions.

Author: kierans

.github/workflows/ci.yml

@@ -21,10 +21,10 @@ jobs:
           registry-url: https://registry.npmjs.org/
 
       - name: Rush CLI
-        run: npm install -g @microsoft/rush
+        run: npm install -g @microsoft/rush@5.50.0
 
       - name: Rush Install
-        uses: advancedcsg-open/actions-rush@v1.0.1
+        uses: advancedcsg-open/actions-rush@v1.4.5
 
       - name: Rush Build
         run: rush build