Update CI: drop EOL Node versions, bump actions (#196)

* Update CI: drop EOL Node versions, bump actions

- Node matrix: 14.x, 16.x, 18.x, 20.x → 18.x, 20.x, 22.x
  - Node 14 EOL April 2023, Node 16 EOL September 2023
  - Add Node 22 (current LTS)
- Bump actions/checkout v2 → v4, actions/setup-node v3 → v4
  - v2/v3 use Node 16 runtime which is deprecated by GitHub

This fixes the Floating Dependencies CI failure where @aws-sdk/client-s3
v3.986.0+ requires Node >= 20, breaking the no-lockfile install on
older Node versions.

* Drop Node 18 from CI matrix

@aws-sdk/client-s3 v3.1000.0 requires Node >= 20, which breaks
floating deps installs on Node 18. Node 18 went EOL April 2025.

---------

Co-authored-by: Yappie LLM <ylm@Yappies-Mac-mini.local>

Author: lukemelia

.github/workflows/ci.yml

@@ -10,11 +10,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 20.x]
+        node-version: [20.x, 22.x]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
         cache: 'yarn'
@@ -26,11 +26,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 20.x]
+        node-version: [20.x, 22.x]
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
         cache: 'yarn'