ci: pin node to lts and 20.2

Node version 20.3 introduces a concurrency issue where the same file is
getting accessed by multiple things as part of the rollup process.
Unsure as to the root cause, but this commit pins current to 20.2 to
resolve the build issues for now.

A future commit should either fix the 20.3 issues.

Author: luqven

.circleci/config.yml

@@ -35,7 +35,7 @@ workflows:
           matrix:
             parameters:
               version:
-                - "current"
+                - "20.2"
                 - "lts"
       - deploy:
           requires: