Using Node 17 in CircleCI

Removed tests for Node 15. They are flaky and this version is not
supported any more.

Author: tomek-ac

.circleci/config.yml

@@ -5,31 +5,32 @@ workflows:
     jobs:
       # The versions are copied from
       # https://circleci.com/developer/images/image/cimg/node#image-tags
+      # End of Life (EOL): https://endoflife.date/nodejs
       - unit-tests:
-          name: node13
+          name: node13 # EOL 01 Jun 2020
           version: "13.14.0"
       - unit-tests:
-          name: node14
+          name: node14 # EOL 30 Apr 2023
           version: "14.21.1"
           requires:
             - node13
       - unit-tests:
-          name: node15
-          version: "15.14.0"
+          name: node16 # EOL 11 Sep 2023
+          version: "16.18.1"
           requires:
             - node14
       - unit-tests:
-          name: node16
-          version: "16.18.1"
+          name: node17 # EOL 01 Jun 2022
+          version: "17.9.1"
           requires:
-            - node15
+            - node16
       - unit-tests:
-          name: node18
+          name: node18 # EOL 30 Apr 2025
           version: "18.12.1"
           requires:
-            - node16
+            - node17
       - unit-tests:
-          name: node19
+          name: node19 # EOL 01 Jun 2023
           version: "19.3.0"
           requires:
             - node18