Disabled always failing integration test suite (#1397)

The test issue is related to this message and happened also sometimes in the past:

> utest.AssertionError: assert(eval("core.test"))
> java.lang.Exception: Resource amm-dependencies.txt not found

Pull request: #1397

.github/workflows/actions.yml

@@ -24,7 +24,8 @@ jobs:
  - ./mill -i docs.antora.githubPages
  include:
  - java-version: 8
- buildcmd: ./mill -i integration.test "mill.integration.local.{BetterFilesTests,UpickleTests}"
+ # buildcmd: ./mill -i integration.test "mill.integration.local.{BetterFilesTests,UpickleTests}"
+ buildcmd: ./mill -i integration.test "mill.integration.local.UpickleTests"
 
  runs-on: ubuntu-latest