chore: remove pnpm version specification from CI workflows

Author: chaxus

.github/workflows/ci.yml

@@ -27,7 +27,6 @@ jobs:
         name: Install pnpm
         id: pnpm-install
         with:
-          version: 10
           run_install: false
 
       - name: Get pnpm store directory

.github/workflows/pages-build-site.yml

@@ -35,7 +35,6 @@ jobs:
         name: Install pnpm
         id: pnpm-install
         with:
-          version: 10
           run_install: false
 
       - name: Get pnpm store directory
@@ -78,7 +77,6 @@ jobs:
         name: Install pnpm
         id: pnpm-install
         with:
-          version: 10
           run_install: false
 
       - name: Get pnpm store directory