fix(ci): let pnpm/action-setup read version from packageManager

Remove explicit `version: 8` from workflows; package.json pins
pnpm@8.15.0 and duplicate specs caused ERR_PNPM_BAD_PM_VERSION.

Author: ccashwell

.github/workflows/ci.yml

@@ -18,8 +18,6 @@ jobs:
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Setup Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
@@ -65,8 +63,6 @@ jobs:
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -102,8 +98,6 @@ jobs:
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Setup Node.js
         uses: actions/setup-node@v4

.github/workflows/publish.yml

@@ -16,8 +16,6 @@ jobs:
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Setup Node.js
         uses: actions/setup-node@v4