Don't test on Node versions before 18.20.5

18.20.5 is the oldest version supported by jasmine-core, because it's the
oldest version supported by current selenium-webdriver. Also, many dev
dependencies require at least 18.18.0.

Author: sgravrock

.circleci/config.yml

@@ -21,7 +21,7 @@ executors:
     working_directory: ~/workspace
   node18:
     docker:
-      - image: cimg/node:18.0.0
+      - image: cimg/node:18.20.5
     working_directory: ~/workspace
 
 jobs:

README.md

@@ -47,7 +47,7 @@ Jasmine is compatible with both ES modules and CommonJS modules. See the
 
 ## Node version compatibility
 
-Jasmine supports Node 18*, 20, 22, and 24.
+Jasmine supports Node 18.20.5+*, 20, 22, and 24.
 
 \* Environments that are past end of life are supported on a best-effort basis.
 They may be dropped in a future minor release of Jasmine if continued support