Fix Jacoco failure (#5994)

Motivation:

```
Caused by: java.lang.IllegalStateException: Can't add different class with same name: com/linecorp/armeria/common/logback/LoggingEventWrapper
	at org.jacoco.core.analysis.CoverageBuilder.visitCoverage(CoverageBuilder.java:106)
	at org.jacoco.core.analysis.Analyzer$1.visitEnd(Analyzer.java:100)
	at org.objectweb.asm.ClassVisitor.visitEnd(ClassVisitor.java:395)
	at org.jacoco.core.internal.flow.ClassProbesAdapter.visitEnd(ClassProbesAdapter.java:100)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:749)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:425)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:117)
	at org.jacoco.core.analysis.Analyzer.analyzeClass(Analyzer.java:133)
	... 152 more
```

Modifications:

- Set `no_aggregation` flag to `:it:logback1.5`

Result:

Fixes #5989

settings.gradle

@@ -219,7 +219,7 @@ includeWithFlags ':it:jackson-provider',                       'java', 'relocate
 includeWithFlags ':it:kotlin',                                 'java', 'relocate', 'kotlin'
 includeWithFlags ':it:kubernetes-chaos-tests',                 'java', 'relocate'
 includeWithFlags ':it:logback1.4',                             'java11', 'relocate'
-includeWithFlags ':it:logback1.5',                             'java11', 'relocate'
+includeWithFlags ':it:logback1.5',                             'java11', 'relocate', 'no_aggregation'
 includeWithFlags ':it:multipart',                              'java17', 'relocate'
 includeWithFlags ':it:nio',                                    'java', 'relocate'
 includeWithFlags ':it:okhttp',                                 'java', 'relocate'