Bump actions/setup-node from 5 to 6

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 5 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v5...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-tests.yml

@@ -25,7 +25,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Setup Node 22
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22.18.0"
 

.github/workflows/lint.yml

@@ -37,7 +37,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Setup Node 22
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22.18.0"
 
@@ -60,7 +60,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Setup Node 22
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22.18.0"
 
@@ -100,7 +100,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Setup Node 22
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22.18.0"
 

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Setup Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: "22"