Add logger dependency to suppress Ruby 3.5.0 deprecation warning

Starting from Ruby 3.5.0, logger will no longer be part of the default gems.
This change adds logger as an explicit runtime dependency to prevent
deprecation warnings.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: pimpin

couchbase-orm.gemspec

@@ -23,6 +23,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency     'couchbase',    '>= 3.4.2'
   gem.add_runtime_dependency     'radix',        '~> 2.2' # converting numbers to and from any base
   gem.add_runtime_dependency     'json-schema',  '>= 3' # validating JSON against a schema
+  gem.add_runtime_dependency     'logger' # Required from Ruby 3.5.0+
 
   gem.add_development_dependency 'rake', '~> 12.2'
   gem.add_development_dependency 'rspec', '~> 3.7'