build: Keep some older versions

Author: haphut

.github/workflows/test-and-build.yml

@@ -37,4 +37,4 @@ jobs:
         with:
           package-type: 'maven'
           package-name: 'fi.hsl.transitdata-common'
-          min-versions-to-keep: 5
+          min-versions-to-keep: 50