Fix AssetManagerTest.testPullHashTwice using commit hash resolved as tag-relative ref [ci fast]

The previous commit hash was resolved by JGit nameRev to v1.3~21,
causing a RefNotAdvertisedException on the second download. Use a
commit hash that is beyond all tags to avoid this issue.

Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Paolo Di Tommaso <paolo.ditommaso@gmail.com>

Author: pditommaso

modules/nextflow/src/test/groovy/nextflow/scm/AssetManagerTest.groovy

@@ -207,12 +207,12 @@ class AssetManagerTest extends Specification {
         def manager = new AssetManager().build('nextflow-io/hello', [providers: [github: [auth: token]]])
 
         when:
-        manager.download("6b9515aba6c7efc6a9b3f273ce116fc0c224bf68")
+        manager.download("d828daeef77f391c456896a7a6384b5f76ceea41")
         then:
         folder.resolve('nextflow-io/hello/.git').isDirectory()
 
         when:
-        def result = manager.download("6b9515aba6c7efc6a9b3f273ce116fc0c224bf68")
+        def result = manager.download("d828daeef77f391c456896a7a6384b5f76ceea41")
         then:
         noExceptionThrown()
         result == "Already-up-to-date"