Update langchainrb requirement from ~> 0.7.0 to >= 0.7, < 0.9 (#23)

Updates the requirements on [langchainrb](https://github.com/andreibondarev/langchainrb) to permit the latest version.
- [Release notes](https://github.com/andreibondarev/langchainrb/releases)
- [Changelog](https://github.com/andreibondarev/langchainrb/blob/main/CHANGELOG.md)
- [Commits](patterns-ai-core/langchainrb@0.7.5...0.8.0)

---
updated-dependencies:
- dependency-name: langchainrb
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     langchainrb_rails (0.1.5)
-      langchainrb (~> 0.7.0)
+      langchainrb (>= 0.7, < 0.9)
 
 GEM
   remote: https://rubygems.org/
@@ -114,7 +114,7 @@ GEM
     json (2.6.3)
     json-schema (4.0.0)
       addressable (>= 2.8)
-    langchainrb (0.7.5)
+    langchainrb (0.8.0)
       baran (~> 0.1.9)
       colorize (~> 0.8.1)
       json-schema (~> 4.0.0)

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"
+  spec.add_dependency "langchainrb", ">= 0.7", "< 0.9"
 
   spec.add_development_dependency "pry-byebug", "~> 3.10.0"
   spec.add_development_dependency "yard", "~> 0.9.34"