remove stray redis dependency, and upgrade node in tests (#173)

* remove stray redis dependency in test
* tweak handling of database connection between tests
* upgrade node versions in tests, type guessing in node 10 has problems

.github/workflows/docker_latest.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         python-version: [2.7]
-        node-version: [10.x]
+        node-version: [14.x]
     steps:
       - name: Check out the repo
         uses: actions/checkout@v2

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         python-version: [2.7]
-        node-version: [10.x]
+        node-version: [14.x]
 
     steps:
       - uses: actions/checkout@v2