chore(deps): bump actions/setup-node from 3 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 3 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v3...v6)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/backend-test-windows.yml

@@ -66,7 +66,7 @@ jobs:
         with:
           bun-version: 1.3.10
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "20"
 

.github/workflows/backend-test.yml

@@ -57,7 +57,7 @@ jobs:
       - uses: oven-sh/setup-bun@v2
         with:
           bun-version: 1.3.10
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "20"
       - uses: astral-sh/setup-uv@v6.2.1

.github/workflows/cli-tests.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "20"
 
@@ -70,7 +70,7 @@ jobs:
           cache-workspaces: backend
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "20"
 
@@ -124,7 +124,7 @@ jobs:
           cache-workspaces: backend
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "20"
 

.github/workflows/frontend-check.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubicloud-standard-8
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: "npm"

.github/workflows/git-sync-test.yml

@@ -129,7 +129,7 @@ jobs:
         with:
           deno-version: v2.x
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: "20"
 

.github/workflows/npm_on_release.yml

@@ -13,7 +13,7 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           node-version: "20.x"
           registry-url: "https://registry.npmjs.org"
@@ -25,7 +25,7 @@ jobs:
       id-token: write
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           node-version: "20.x"
           registry-url: "https://registry.npmjs.org"

.github/workflows/validate-openapi.yml

@@ -15,7 +15,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Set up Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: '20'