Backport PR #12791 to 7.x: Deps: update JRuby to 9.2.18.0

[kares]

Backport PR #12791 to 7.x branch. Original message:

Version bump of JRuby.

Release notes

Includes upstream fixes for ARM64 support.

What does this PR do?

Dependency update, release notes (since 9.2.16.0):
https://www.jruby.org/2021/03/29/jruby-9-2-17-0.html
https://www.jruby.org/2021/06/08/jruby-9-2-18-0.html

JRuby 9.2.18.0 include JNR fixes for ARM64: jnr/jnr-ffi#240 jnr/jnr-posix#165

Checklist

Author's Checklist

• a potential blocker due LS' reuse of vendor/jruby/bin/jruby e.g. from bin/logstash-plugin
  (present in 9.2.17.0 but resolved in 9.2.18.0)
• another suspicious issue with String#split

Related issues

#12077 (unfortunately the auto-load fixes were not backported to RGs 3.1)

[jsvd]

LGTM on green build

[kares]

there's a new failure due Bundler 1.17 using deprecated Rubygems API (JRuby did update RGs in 9.2.17.0)

11:53:02     Failures:
11:53:02 
11:53:02       1) CLI > logstash-plugin prepare-offline-pack create a pack from a wildcard successfully create a pack
11:53:02          Failure/Error: expect(unpacked.plugins.collect(&:name)).to include(*filters)
11:53:02            expected ["logstash-filter-uuid", "logstash-filter-qatest", "logstash-filter-useragent", "logstash-filter-diss...ogstash-filter-truncate", "logstash-filter-memcached", "logstash-filter-ruby", "logstash-filter-kv"] to include "/opt/logstash/build/logstash-7.14.0-SNAPSHOT/vendor/bundle/jruby/2.5.0/gems/bundler-1.17.3/lib/bundler/rubygems_integration.rb:200: warning: constant Gem::ConfigMap is deprecated"
11:53:02          # ./specs/cli/prepare_offline_pack_spec.rb:92:in `block in <main>'
11:53:02          # /opt/logstash/build/qa/integration/vendor/jruby/2.5.0/gems/rspec-wait-0.0.9/lib/rspec/wait.rb:46:in `block in <main>'
11:53:02          # ./rspec.rb:32:in `<main>'
11:53:02 
11:53:02     Finished in 14 minutes 35 seconds (files took 5.26 seconds to load)
11:53:02     31 examples, 1 failure
11:53:02 
11:53:02     Failed examples:
11:53:02 
11:53:02     rspec ./specs/cli/prepare_offline_pack_spec.rb:77 # CLI > logstash-plugin prepare-offline-pack create a pack from a wildcard successfully create a pack
11:53:02 
11:53:02     Randomized with seed 24495