bumped Node 12 test to 12.20.1 (version currently recommended by AWS Elastic Beanstalk)

Author: mtrezza

.github/workflows/ci.yml

@@ -62,11 +62,11 @@ jobs:
             MONGODB_TOPOLOGY: standalone
             MONGODB_STORAGE_ENGINE: wiredTiger
             NODE_VERSION: 10
-          - name: Node 12.12.0
+          - name: Node 12.20
             MONGODB_VERSION: 4.4.3
             MONGODB_TOPOLOGY: standalone
             MONGODB_STORAGE_ENGINE: wiredTiger
-            NODE_VERSION: 12.12.0
+            NODE_VERSION: 12.20.1
     name: ${{ matrix.name }}
     timeout-minutes: 30
     runs-on: ubuntu-18.04