Remove explicit dep on jar-dependencies

Jruby ships with a version of this gem. Managing with bundler causes load issues. 

See elastic/ingest-dev#4691

Author: donoghuc

logstash-input-http.gemspec

@@ -22,7 +22,6 @@ Gem::Specification.new do |s|
   # Gem dependencies
   s.add_runtime_dependency "logstash-core-plugin-api", ">= 1.60", "<= 2.99"
   s.add_runtime_dependency 'logstash-codec-plain'
-  s.add_runtime_dependency 'jar-dependencies', '~> 0.3', '>= 0.3.4'
   s.add_runtime_dependency 'logstash-mixin-ecs_compatibility_support', '~>1.2'
   s.add_runtime_dependency 'logstash-mixin-normalize_config_support', '~>1.0'