ci: remove hardcoded pnpm version from workflows

Author: ahonn

.github/workflows/publish.yml

@@ -23,8 +23,6 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: '10.12.1'
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile

.github/workflows/release.yml

@@ -27,8 +27,6 @@ jobs:
 
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
-        with:
-          version: '10.12.1'
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile