Bump langchainrb version

Author: andreibondarev

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     langchainrb_rails (0.1.12)
-      langchainrb (>= 0.7, < 0.17)
+      langchainrb (>= 0.7, < 0.19)
 
 GEM
   remote: https://rubygems.org/

langchainrb_rails.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "langchainrb", ">= 0.7", "< 0.17"
+  spec.add_dependency "langchainrb", ">= 0.7", "< 0.19"
 
   spec.add_development_dependency "pry-byebug", "~> 3.10.0"
   spec.add_development_dependency "yard", "~> 0.9.34"