pin pnpm

Author: gregfromstl

.github/composite-actions/install/action.yml

@@ -12,7 +12,7 @@ runs:
     # pnpm for our dependencies
     - uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
       with:
-        version: 9
+        version: 9.11.0
     - name: Setup Node.js
       uses: actions/setup-node@1d0ff469b7ec7b3cb9d8673fde0c81c44821de2a # v4.2.0
       with: