Update z_rubycheck.rake to no longer inject Xmx1g (#17212)

This allows the environment variable JRUBY_OPTS to be used for setting properties like Xmx
original pr: #16420

(cherry picked from commit f562f37)

Co-authored-by: kaisecheng <[email protected]>

Author: github-actions[bot]

rakelib/z_rubycheck.rake

@@ -29,7 +29,7 @@ if ENV['USE_RUBY'] != '1'
 
     # Ignore Environment JAVA_OPTS
     ENV["JAVA_OPTS"] = ""
-    exec(jruby, "-J-Xmx1g", "-S", rake, *ARGV)
+    exec(jruby, "-S", rake, *ARGV)
   end
 end