chore(deps): update pnpm/action-setup action to v4.2.0 (withastro#12522)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Chris Swithinbank <[email protected]>

Author: renovate[bot]

.github/actions/install/action.yml

@@ -5,7 +5,7 @@ runs:
   using: composite
   steps:
     - name: Setup PNPM
-      uses: pnpm/action-setup@a7487c7e89a18df4991f7f222e4898a00d66ddda # v4.1.0
+      uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0
 
     - name: Setup Node
       uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0