fix: RDCC-4948 Altered the mutation threshold (#342)

build.gradle

@@ -243,7 +243,7 @@ pitest {
     historyOutputLocation = 'build/reports/pitest/fastermutationtestingoutput'
     outputFormats = ['XML', 'HTML']
     timestampedReports = false
-    mutationThreshold = 80
+    mutationThreshold = 75
     useClasspathFile = true
 }