Bump mirrored CI workflow to Node 22

Author: Copilot

.github/workflows/ci.yml

@@ -16,19 +16,19 @@ jobs:
         include:
           - name: macOS
             os: macos-latest
-            node_version: '18'
+            node_version: '22'
             only_minspec: false
           - name: Linux
             os: ubuntu-22.04
-            node_version: '18'
+            node_version: '22'
             only_minspec: false
           - name: LinuxMinspec
             os: ubuntu-22.04
-            node_version: '18'
+            node_version: '22'
             only_minspec: true
           - name: Windows
             os: windows-latest
-            node_version: '18'
+            node_version: '22'
             only_minspec: false
     name: ${{ matrix.name }}
     runs-on: ${{ matrix.os }}