Bump langchainrb gem version

Author: andreibondarev

Gemfile

@@ -4,7 +4,7 @@ ruby "3.3.4"
 
 source "https://rubygems.org"
 
-gem "langchainrb", "0.18.0"
+gem "langchainrb", "0.19.0"
 gem "ruby-openai"
 gem "pry-byebug"
 gem "dotenv"

Gemfile.lock

@@ -19,7 +19,7 @@ GEM
     json (2.7.2)
     json-schema (4.3.1)
       addressable (>= 2.8)
-    langchainrb (0.18.0)
+    langchainrb (0.19.0)
       baran (~> 0.1.9)
       json-schema (~> 4)
       matrix
@@ -44,15 +44,15 @@ GEM
       faraday (>= 1)
       faraday-multipart (>= 1)
     uri (0.13.1)
-    zeitwerk (2.7.0)
+    zeitwerk (2.7.1)
 
 PLATFORMS
   arm64-darwin-23
   ruby
 
 DEPENDENCIES
   dotenv
-  langchainrb (= 0.18.0)
+  langchainrb (= 0.19.0)
   pry-byebug
   ruby-openai