Test against Kotlin 2.0.20 in CI workflows

.circleci/config.yml

@@ -21,7 +21,7 @@ commands:
       - sdkman/setup-sdkman
       - sdkman/sdkman-install:
           candidate: kotlin
-          version: 2.0.0
+          version: 2.0.20
       - run:
           name: Download dependencies
           command: ./bld download

.github/workflows/bld.yml

@@ -1,6 +1,6 @@
 name: bld-ci
 
-on: [ push, pull_request, workflow_dispatch ]
+on: [push, pull_request, workflow_dispatch]
 
 env:
   ALPHAVANTAGE_API_KEY: ${{ secrets.ALPHAVANTAGE_API_KEY }}
@@ -22,8 +22,8 @@ jobs:
 
     strategy:
       matrix:
-        java-version: [ 17, 21, 22 ]
-        kotlin-version: [ 1.9.24, 2.0.0 ]
+        java-version: [17, 21, 22]
+        kotlin-version: [1.9.24, 2.0.20]
 
     steps:
       - name: Checkout source repository