Remove PNPM version specification from workflow files

.github/workflows/bundlewatch.yml

@@ -26,8 +26,6 @@ jobs:
      
       - name: Install PNPM
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Set up Bundler
         uses: ruby/setup-ruby@v1

.github/workflows/release.yml

@@ -30,8 +30,6 @@ jobs:
 
       - name: Install PNPM
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - name: Install Dependencies
         run: pnpm install

.github/workflows/test.yml

@@ -24,8 +24,6 @@ jobs:
 
       - name: Install PNPM
         uses: pnpm/action-setup@v4
-        with:
-          version: 8
 
       - run: node --version