Build(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/cdk-test.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           node-version-file: ".nvmrc"
           cache: "yarn"

.github/workflows/notification-worker-lambdas.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Setup JDK and sbt
         uses: guardian/setup-scala@v1
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           cache: npm
           cache-dependency-path: cdk/package-lock.json

.github/workflows/registration.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup JDK and sbt
         uses: guardian/setup-scala@v1
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           cache: npm
           cache-dependency-path: cdk/package-lock.json

.github/workflows/slo-monitor.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Setup JDK and sbt
         uses: guardian/setup-scala@v1
 
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v6
         with:
           cache: npm
           cache-dependency-path: cdk/package-lock.json