ci: bump pnpm/action-setup v4 -> v6 for pnpm 11 support

v6.0.0 adds support for pnpm v11, which changes the default
global-bin-dir to $PNPM_HOME/bin. v4 still adds only $PNPM_HOME to
PATH, so `pnpm add turbo --global` fails on CI runners with
"global bin directory ... is not in PATH".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/ci-app.yml

@@ -49,7 +49,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v4
         with:
@@ -104,7 +104,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v4
         with:
@@ -169,7 +169,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@v6
 
       - uses: actions/setup-node@v4
         with:

.github/workflows/ci-pdf-converter.yml

@@ -34,7 +34,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -70,7 +70,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -109,7 +109,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/ci-slackbot-proxy.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -100,7 +100,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -178,7 +178,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/release-pdf-converter.yml

@@ -81,7 +81,7 @@ jobs:
       with:
         ref: ${{ github.event.pull_request.base.ref }}
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/release-slackbot-proxy.yml

@@ -88,7 +88,7 @@ jobs:
       with:
         ref: ${{ github.event.pull_request.base.ref }}
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/release-subpackages.yml

@@ -33,7 +33,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -67,7 +67,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/release.yml

@@ -22,7 +22,7 @@ jobs:
       with:
         ref: ${{ github.event.pull_request.base.ref }}
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -159,7 +159,7 @@ jobs:
       with:
         ref: v${{ needs.create-github-release.outputs.RELEASED_VERSION }}
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:

.github/workflows/reusable-app-prod.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -144,8 +144,8 @@ jobs:
       run: |
         tar -xf ${{ needs.build-prod.outputs.PROD_FILES }}
 
-    # Run after extraction so pnpm/action-setup@v4 can read packageManager from package.json
-    - uses: pnpm/action-setup@v4
+    # Run after extraction so pnpm/action-setup@v6 can read packageManager from package.json
+    - uses: pnpm/action-setup@v6
 
     - name: pnpm run server:ci
       working-directory: ./apps/app
@@ -204,7 +204,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with:
@@ -311,7 +311,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - uses: pnpm/action-setup@v4
+    - uses: pnpm/action-setup@v6
 
     - uses: actions/setup-node@v4
       with: