Disable output caching for jmh module (#5651)

**Motivation**

We often run benchmarks several times without modifying the code.
However, with gradle up-to-date checks, we can often see that only the
first run actually applies benchmarks.
I think it's reasonable that the jmh task output caching is always
disabled

**Modifications**

Always disable output caching for jmh tasks

**Result**

It is easier to run benchmarks

benchmarks/jmh/build.gradle

@@ -82,6 +82,11 @@ jmh {
     }
 }
 
+// Disable output caching so that benchmarks are not skipped on the second run.
+tasks.jmh.outputs.upToDateWhen {
+    false
+}
+
 // Workaround a bug where the conflict of output path between 'benchmarks.jmh' and 'benchmarks.test' in IDEA
 project.afterEvaluate {
     idea {