8254292: Update JMH devkit to 1.26

Reviewed-by: erikj, aph

Author: shipilev

make/devkit/createJMHBundle.sh

@@ -26,7 +26,7 @@
 # Create a bundle in the build directory, containing what's needed to
 # build and run JMH microbenchmarks from the OpenJDK build.
 
-JMH_VERSION=1.21
+JMH_VERSION=1.26
 COMMONS_MATH3_VERSION=3.2
 JOPT_SIMPLE_VERSION=4.6