Fixup: Use a compatible version of pnpm for node 16

Author: weirdwater

.github/workflows/TestPWTCommands.yml

@@ -44,8 +44,15 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda #v4.1.0
+        if: matrix.node == 16
+        with:
+          version: 8
+      - name: Setup pnpm
+        uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda #v4.1.0
+        if: matrix.node == 18
         with:
           version: 10
+
       - name: "Defining node version"
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with: