Bump actions/setup-node from 4 to 6 (#215)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 6.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v4...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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
 
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'
@@ -32,7 +32,7 @@ jobs:
 
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'
@@ -45,7 +45,7 @@ jobs:
 
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'
@@ -58,7 +58,7 @@ jobs:
 
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'

.github/workflows/firebase-hosting-merge.yml

@@ -8,7 +8,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'

.github/workflows/firebase-hosting-pull-request.yml

@@ -6,7 +6,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - uses: actions/checkout@v6
-            - uses: actions/setup-node@v4
+            - uses: actions/setup-node@v6
               with:
                   node-version: 20.9.0
                   cache: 'npm'