Bump Node.js version to 22 in remaining GitHub Actions workflows

Update all GitHub Actions workflows to use Node.js 22, completing the migration started in #1773. This ensures consistency across all CI/CD pipelines and aligns with the package.json requirement of Node.js >=22.0.

Updated workflows:
- create-build-artifacts.yml: 18 → 22
- push.yml: 18.x → 22.x
- release-pr.yml: 18.x → 22.x
- unit-tests.yml: 18.x → 22.x
- update-cli-version.yml: 18.x → 22.x

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fjakobs

.github/workflows/create-build-artifacts.yml

@@ -16,10 +16,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Use Node.js 18
+      - name: Use Node.js 22
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 22
           cache: "yarn"
 
       - run: yarn install

.github/workflows/push.yml

@@ -13,10 +13,10 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Use Node.js 18.x
+      - name: Use Node.js 22.x
         uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: 22.x
           cache: "yarn"
 
       - run: yarn install --immutable

.github/workflows/release-pr.yml

@@ -23,7 +23,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [22.x]
     steps:
       - uses: actions/checkout@v4
         with:

.github/workflows/unit-tests.yml

@@ -15,7 +15,7 @@ jobs:
             os: macos-latest
           - cli_arch: windows_amd64
             os: windows-latest
-        node-version: [18.x]
+        node-version: [22.x]
         vscode-version: [stable]
 
     runs-on: ${{ matrix.arch.os }}

.github/workflows/update-cli-version.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x]
+        node-version: [22.x]
 
     steps:
       - uses: actions/checkout@v4