Cleanup warning: max= is deprecated. Use exclude_limit <ParameterName> instead.

[jdehaan]

With rubocop version 1.65.0, running the cop yields warning messages on the console:

rubocop-rspec-3.0.2/lib/rubocop/cop/rspec/multiple_memoized_helpers.rb:97: \
   warning: `max=` is deprecated. Use `exclude_limit <ParameterName>` instead.

There is some adaptation needed, but probably some care about dependencies or version compatibility needs to be taken to allow interoperability between versions if that is wanted.

[koic]

This warning will be resolved by #1936. It should be suppressible by upgrading after the release.