Set DEBUG logs for release tasks in CI pipeline

This commit configures the logging level to DEBUG for the concourse
release scripts tasks.

This is useful to get a clue on where those long-running tasks are at.

ci/config/release-scripts.yml

+logging:
+  level:
+    io.spring.concourse: DEBUG
 distribute:
   optional-deployments:
     - '.*\\.zip'
+spring:
+  main:
+    banner-mode: off
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